Create more unit tests for USB Devices and Printer Driver (#21)

Reviewed-on: #21

.clangd

@@ -0,0 +1,11 @@
+---
+If:
+  PathMatch: tests/.*
+CompileFlags:
+  CompilationDatabase: builddir-debug/
+
+---
+If:
+  PathMatch: src/.*
+CompileFlags:
+  CompilationDatabase: builddir/

.gitea/workflows/build.yaml

@@ -14,7 +14,7 @@ jobs:
       - name: install meson
         run: apt-get -yq install meson
       - name: Install build dependencies
-        run: apt-get -yq install libusb-1.0-0-dev libspdlog-dev libfmt-dev libpango1.0-dev libcairo2-dev gcovr
+        run: apt-get -yq install libusb-1.0-0-dev libpango1.0-dev libcairo2-dev gcovr
       - name: get build environment versions
         run: |
           echo "=== Start meson version ==="
@@ -32,23 +32,25 @@ jobs:
           echo "=== Start dependency package version ==="
           apt-cache policy libpango1.0-dev
           apt-cache policy libcairo2-dev
-          apt-cache policy libfmt-dev 
-          apt-cache policy libspdlog-dev
           apt-cache policy libusb-1.0-0-dev
           echo "=== End dependency package version ==="
-      - name: setup builddir
+      - name: Build ptprnt debug
-        run: meson setup builddir -Db_coverage=true
+        run: scripts/build.sh debug --coverage --test
-      - name: build and test dist package
+      - name: Generate coverage
-        run: ninja -C builddir dist
+        run: scripts/generate_coverage.sh --text
-      - name: run unit tests
-        run: ninja -C builddir test
-      - name: calculate coverage
-        run: ninja -C builddir coverage-text
       - name: Coverage report
-        run: cat ./builddir/meson-logs/coverage.txt
+        run: cat ./coverageReport/coverage.txt
-      - name: upload dist package
+      - name: build release
+        run: scripts/build.sh release
+      - name: upload release binary
         uses: actions/upload-artifact@v3
         with:
-          name: ptprnt-dist
+          name: ptprnt
-          path: ./builddir/meson-dist/*
+          path: ./builddir/ptprnt
+          if-no-files-found: error
+      - name: upload coverage report
+        uses: actions/upload-artifact@v3
+        with:
+          name: coverage.txt
+          path: ./coverageReport/coverage.txt
           if-no-files-found: error

.gitignore

@@ -1,6 +1,5 @@
 # Folder
-builddir/
+builddir*/
-ptouch-print/
 subprojects/*
 .cache/
 coverageReport/
@@ -12,3 +11,16 @@ ptprnt.log
 !.vscode/c_cpp_properties.json
 !.vscode/settings.json
 !.vscode/launch.json
+
+# ignore generated testlabels
+fakelabel_*.png
+
+# ignore package capture files
+*.pcapng
+*.pcapng.gz
+*.pcap
+*.pcap.gz
+
+# ignore coverage temporaries
+*.gcov.json
+*.gcov.json.gz

.vscode/c_cpp_properties.json

@@ -5,11 +5,12 @@
       "compilerPath": "/usr/bin/clang",
       "cStandard": "c11",
       "cppStandard": "c++20",
-      "compileCommands": "${workspaceFolder}/builddir/compile_commands.json",
       "browse": {
-        "path": ["${workspaceFolder}"]
+        "path": [
+          "${workspaceFolder}"
+        ]
       }
     }
   ],
   "version": 4
-}
+}

.vscode/settings.json

@@ -1,7 +1,6 @@
 {
   "clangd.arguments": [
     "-background-index",
-    "-compile-commands-dir=builddir/"
   ],
   "editor.formatOnType": false,
   "editor.formatOnSave": true,

CHANGELOG.md

@@ -0,0 +1,70 @@
+# Changelog
+
+All notable changes to ptprnt will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [0.2.0] - v0.2.0
+
+### Added
+- Multi-label support - print multiple labels in sequence
+- LabelBuilder API with fluent interface for constructing labels
+- FakePrinter driver for testing without hardware (outputs PNG files)
+- PrinterService core service for printer operations
+- CliParser component with ICliParser interface
+- ICairoWrapper interface for testable graphics rendering
+- MockCairoWrapper for unit testing
+- Pre-commit hook for automatic copyright updates
+- USB trace mode for debugging (`-Dusb_trace_only=true`)
+
+### Changed
+- **Major refactoring**: Reorganized codebase into layered architecture
+  - Application layer: PtouchPrint, CliParser, PrinterService
+  - Printer drivers: Moved to `src/printers/` with factory pattern
+  - Graphics system: Added builder pattern and Cairo abstraction
+  - Core services: Separated into `src/core/` directory
+- Label class now uses dependency injection for Cairo/Pango
+- CLI parsing separated from main application logic
+- Updated dependencies to latest versions
+- Improved project documentation (README.md, CLAUDE.md)
+
+### Fixed
+- Label corruption issues resolved
+- Printer info retrieval bugs
+- USB attachment logic
+- Multiple lines handling in labels
+- Printer selection logic
+
+## [0.1.0] - 2024
+
+### Added
+- Initial release of ptprnt
+- Basic label printing functionality for Brother P-touch P700 series
+- Pango/Cairo-based text rendering
+- USB device communication via libusb-1.0
+- Template-based Bitmap class supporting multiple pixel formats (ALPHA8, RGBX8, RGBA8, ARGB8)
+- Monochrome bitmap conversion for printer output
+- PrinterDriverFactory for creating printer instances
+- USB device abstraction layer (IUsbDevice, UsbDevice, UsbDeviceFactory)
+- Command-line interface using CLI11
+- Logging with spdlog and file output
+- Unit tests using GoogleTest
+- Code coverage reporting with gcovr
+- Meson build system with C++20 support
+- CI/CD pipeline with automated testing
+
+### Core Components (v0.1.0)
+- PtouchPrint: Main application orchestrator
+- P700Printer: Brother P-touch P700 driver implementation
+- Bitmap: Template-based image storage
+- Label: Text rendering with Pango/Cairo
+- Monochrome: Bitmap to monochrome conversion
+- UsbDevice: libusb wrapper for device communication
+
+---
+
+## Project Origins
+
+ptprnt is a modern C++20 rewrite of [ptouch-print](https://git.familie-radermacher.ch/linux/ptouch-print.git).
+All credits for reverse engineering the Brother P-touch USB protocol go to Dominic Rademacher.

README.md

@@ -1,57 +1,252 @@
 # ptprnt
 
-This is a rewrite of [ptouch-print](https://git.familie-radermacher.ch/linux/ptouch-print.git) as a toy project for my personal amusement. The currently available solutions are good enough for generating labels, but i wanted to explore libusb and maybe improve the functionality of my label printer. All credits for reverse engineering the USB commands to Dominic Rademacher.
+A command-line label printer driver for Brother P-touch printers on Linux. Prints text labels directly from your terminal.
 
-## Dependencies
+## Example
-This project requires:
-- spdlog
-- libusb
-- pango
-- cairo
-- meson
-- gtest (optional, for testing, will be installed by meson)
-- gcov (optional, for coverage reports)
 
-Install dependencies on Arch Linux
+Too print a label, provide your text and optionally a font and a font size. This command will print the label below on a Brother P-Touch P700:
-``` bash
-pacman -S libusb spdlog pango cairo meson gcovr
-```
-
-Install dependencies on Debian/Ubuntu
-``` bash
-apt-get install libusb-1.0-0-dev libspdlog-dev libfmt-dev libpango1.0-dev libcairo2-dev meson gcovr
-```
-
-## Build
-
-Clone the repository and simply let meson do the heavy lifting.
 
 ```bash
-meson setup builddir 
+ptprnt --font "NotoMono Nerd Font" --fontsize 32 --text "🖶 ptprnt v0.2.0 🥰"
-```
-If you want to generate coverage reports, enable them via the command line switch
-```bash 
-meson setup builddir -Db_coverage=true
 ```
 
-Rebuild by simply invoking ninja
+![Printed label that proudly reads 🖶 ptprnt v0.2.0 🥰](docs/assets/label_print_v0_2_0.jpg)
+
+## Quick Start
+
+## Quick Start
+
+**Binary dependencies**
+
+Arch Linux:
 ```bash
+pacman -S pango cairo libusb 
+```
+
+Debian/Ubuntu:
+```bash
+apt install libpangocairo-1.0-0 libusb-1.0-0
+```
+
+**Build dependencies:**
+
+Arch Linux:
+```bash
+pacman -S libusb spdlog pango cairo meson
+```
+
+Debian/Ubuntu:
+```bash
+apt install libusb-1.0-0-dev libspdlog-dev libfmt-dev libpango1.0-dev libcairo2-dev meson
+```
+
+Note: spdlog is built as a subproject and statically linked, so it's not required as a system dependency.
+
+**Build and run:**
+Clone this repository first and enter the directory. Then build:
+```bash
+# Using the build script (recommended)
+./scripts/build.sh release
+builddir/ptprnt --help
+
+# Or manually with meson
+meson setup builddir
 ninja -C builddir
+builddir/ptprnt --help
 ```
 
-## Run
+## Usage
-Run the binary from your builddir
-```bash 
-builddir/ptprnt
-```
 
-## Test
+### Basic Text Printing
-Testing is done via gtest. To run your test simply invoke ninja with the "test" target.
+
+Print a simple label with text:
 ```bash
-ninja -C builddir test   
+ptprnt --text "Hello World"
 ```
 
-Coverage reports can be generated via gcov if you enabled them (see Build section) by building the `coverage-text` target.
+### Formatting Options
+
+Control the appearance of your labels with these options:
+
+- `--font FONT_NAME` - Set the font (e.g., "NotoMono Nerd Font", "DejaVu Sans")
+- `--fontsize SIZE` - Set font size in points (default: 24)
+- `--halign ALIGNMENT` - Horizontal alignment: `left`, `center`, `right` (default: center)
+- `--valign ALIGNMENT` - Vertical alignment: `top`, `center`, `bottom` (default: center)
+
+**Example with formatting:**
+```bash
+ptprnt --font "DejaVu Sans Mono" --fontsize 28 --halign left --text "Left aligned text"
+```
+
+### Multiple Text Elements
+
+You can add multiple text elements to a single label. Formatting options apply to all subsequent `--text` arguments until changed:
+
+```bash
+ptprnt \
+  --font "DejaVu Sans" --fontsize 32 --text "Large Title" \
+  --fontsize 18 --text "Smaller subtitle"
+```
+
+### Multiple Labels (Stitching)
+
+Create multiple labels that will be stitched together horizontally using the `--new` flag:
+
+```bash
+ptprnt \
+  --text "Label 1" \
+  --new \
+  --text "Label 2" \
+  --new \
+  --text "Label 3"
+```
+
+Each `--new` starts a fresh label. The labels are automatically stitched together with 60 pixels of spacing.
+
+**Example - Creating a series of address labels:**
+```bash
+ptprnt \
+  --font "DejaVu Sans" --fontsize 20 \
+  --text "Peter Lustig" --text "Am Bauwagen 1" \
+  --new \
+  --text "Donald Duck" --text "Blumenstraße 13" \
+  --new \
+  --text "Homer Simpson" --text "742 Evergreen Terrace"
+```
+
+**Example - Mixed formatting across labels:**
+```bash
+ptprnt \
+  --fontsize 32 --text "BIG" \
+  --new \
+  --fontsize 16 --text "small" \
+  --new \
+  --fontsize 24 --text "medium"
+```
+
+### Printer Selection
+
+By default, ptprnt auto-detects your printer. You can explicitly select a printer:
+
+```bash
+ptprnt --printer P700 --text "Hello"
+```
+
+List all available printer drivers:
+```bash
+ptprnt --list-all-drivers
+```
+
+### Testing with Fake Printer
+
+Before printing to your real printer, you can test your label output using the built-in fake printer. This generates a PNG image file instead of printing:
+
+```bash
+ptprnt --printer FakePrinter --text "Test Label"
+```
+
+This will create a file named `fakelabel_YYYYMMDD_HHMMSS.png` in your current directory with a preview of your label. Use this to:
+- Verify text formatting and layout
+- Test multi-label stitching
+- Preview before wasting label tape
+
+**Example workflow:**
+```bash
+# First, test your label design
+ptprnt --printer FakePrinter \
+  --font "DejaVu Sans" --fontsize 28 \
+  --text "Test Design" --text "Check Layout"
+
+# View the generated PNG file to verify
+# If satisfied, print to real printer
+ptprnt --printer P700 \
+  --font "DejaVu Sans" --fontsize 28 \
+  --text "Test Design" --text "Check Layout"
+```
+
+### Verbose Output
+
+Enable detailed logging for debugging:
+
+```bash
+ptprnt --verbose --text "Debug mode"
+```
+
+Enable USB trace to see raw USB communication:
+```bash
+ptprnt --trace --text "USB trace mode"
+```
+
+### Complete Example
+
+An example using a mixed bag of features:
+
+```bash
+ptprnt \
+  --verbose \
+  --printer P700 \
+  --font "NotoMono Nerd Font" \
+  --fontsize 28 --halign center --text "Product Label" \
+  --fontsize 20 --text "SKU: 12345" \
+  --new \
+  --fontsize 24 --text "Backup Label" \
+  --fontsize 18 --text "Date: 2025-10-16"
+```
+
+## Supported Printers
+(I need more printers for verification 😉)
+
+- Brother P-touch P700 series
+
+## Developer info
+
+This is a modern C++20 rewrite of [ptouch-print](https://git.familie-radermacher.ch/linux/ptouch-print.git). Credits to Dominic Rademacher for reverse engineering the USB protocol.
+
+**Build script:**
+```bash
+# Release build (tests disabled for faster builds)
+./scripts/build.sh release
+
+# Debug build (tests enabled)
+./scripts/build.sh debug
+
+# Debug with tests
+./scripts/build.sh debug --test
+
+# Debug with coverage
+./scripts/build.sh debug --coverage
+
+# Clean all build directories
+./scripts/build.sh clean
+
+# Show all options
+./scripts/build.sh --help
+```
+
+**Note:** Tests are only built in debug mode to keep release builds fast and small. Release builds do not include test binaries or link against gtest/gmock.
+
+**Running tests:**
+```bash
+# Using build script
+./scripts/build.sh --test
+
+# Or manually
+ninja -C builddir test
+```
+
+**Coverage reports:**
+```bash
+# 1. Build with coverage enabled and run tests
+./scripts/build.sh debug --coverage --test
+
+# 2. Generate coverage reports
+./scripts/generate_coverage.sh              # All formats (html, xml, text)
+./scripts/generate_coverage.sh --html       # HTML only
+./scripts/generate_coverage.sh --text       # Text only
+./scripts/generate_coverage.sh --xml        # XML only (for CI/CD)
+./scripts/generate_coverage.sh --html --xml # HTML and XML
+
+```
 
 ## License
 

generate_coverage.sh

@@ -1,27 +0,0 @@
-#!/bin/bash
-
-SCRIPT_PATH="$( cd -- "$(dirname "$0")" >/dev/null 2>&1 ; pwd -P )"
-HTML_COV_PATH="coverageReport/html"
-XML_COV_PATH="coverageReport/xml"
-HTML_START_FILE="index.html"
-
-echo "Generating Coverage report for ptouch-prnt"
-
-ninja -C builddir
-ninja -C builddir test
-
-mkdir -p ${HTML_COV_PATH}
-gcovr --html --html-details --html-syntax-highlighting --filter src --output ${HTML_COV_PATH}/${HTML_START_FILE}
-
-mkdir -p ${XML_COV_PATH}
-gcovr --xml-pretty --filter src --output ${XML_COV_PATH}/cov.xml
-
-if [ $? ] 
-then
-  echo "Coverage report successful generated!"
-  echo "Open: file://${SCRIPT_PATH}/${HTML_COV_PATH}/${HTML_START_FILE}"
-else
-  echo "Error generating coverage report!"
-fi
-
-rm *.gcov

hooks/README.md

@@ -1,6 +1,6 @@
 # Git Hooks
 
-This directory contains git hooks for the ptouch-prnt repository.
+This directory contains git hooks for the ptprnt repository.
 
 ## Installation
 

hooks/install_hooks.sh

@@ -1,5 +1,5 @@
 #!/bin/bash
-# Install git hooks for ptouch-prnt repository
+# Install git hooks for ptprnt repository
 
 set -e
 

meson.build

@@ -1,11 +1,11 @@
 project(
     'ptprnt',
     'cpp',
-    version: 'v0.1.0-' + run_command(
+    version: 'v0.2.0-'
+    + run_command(
         'git',
         'rev-parse',
-        '--short',
+        '--short', 'HEAD',
-        'HEAD',
         check: true,
     ).stdout().strip(),
     license: 'GPLv3',
@@ -20,11 +20,17 @@ project(
 )
 
 usb_dep = dependency('libusb-1.0')
-log_dep = dependency('spdlog')
-fmt_dep = dependency('fmt')
 pangocairo_dep = dependency('pangocairo')
 
-# CLI11 
+# spdlog with std::format (C++20) - static library
+spdlog_proj = subproject('spdlog', default_options: ['std_format=enabled', 'default_library=static', 'compile_library=true'])
+log_dep = spdlog_proj.get_variable('spdlog_dep')
+
+if not log_dep.found()
+    error('spdlog not found, can not proceed')
+endif
+
+# CLI11
 cli11_proj = subproject('cli11')
 cli11_dep = cli11_proj.get_variable('CLI11_dep')
 if not cli11_dep.found()
@@ -41,28 +47,36 @@ cpp_args = ['-DPROJ_VERSION="' + meson.project_version() + '"']
 # USB trace mode option (for debugging without sending to hardware)
 if get_option('usb_trace_only')
     cpp_args += ['-DUSB_TRACE_ONLY']
-    message('USB_TRACE_ONLY enabled: USB data will be logged but not sent to device')
+    message(
+        'USB_TRACE_ONLY enabled: USB data will be logged but not sent to device',
+    )
 endif
 
 ptprnt_exe = executable(
     'ptprnt',
     'src/main.cpp',
     install: true,
-    dependencies: [usb_dep, log_dep, fmt_dep, pangocairo_dep, cli11_dep],
+    dependencies: [usb_dep, log_dep, pangocairo_dep, cli11_dep],
     include_directories: incdir,
     sources: [ptprnt_srcs],
     cpp_args: cpp_args,
 )
 
-
 ### Unit tests
+# Only build tests for debug builds or when explicitly enabled
+build_tests = get_option('buildtype') == 'debug' or get_option('build_tests')
 
-# GTest and GMock
+if build_tests
-gtest_proj = subproject('gtest')
+    # GTest and GMock
-gtest_dep = gtest_proj.get_variable('gtest_main_dep')
+    gtest_proj = subproject('gtest')
-gmock_dep = gtest_proj.get_variable('gmock_main_dep')
+    gtest_dep = gtest_proj.get_variable('gtest_main_dep')
-if not gtest_dep.found()
+    gmock_dep = gtest_proj.get_variable('gmock_main_dep')
-    error('MESON_SKIP_TEST: gtest not installed.')
+    if not gtest_dep.found()
-endif
+        error('MESON_SKIP_TEST: gtest not installed.')
+    endif
 
-subdir('tests')
+    subdir('tests')
+    message('Tests enabled (buildtype=' + get_option('buildtype') + ')')
+else
+    message('Tests disabled (use debug build or -Dbuild_tests=true to enable)')
+endif

meson_options.txt

@@ -2,3 +2,8 @@ option('usb_trace_only',
   type: 'boolean',
   value: false,
   description: 'Enable USB trace mode: log USB data without sending to device (saves label tape during debugging)')
+
+option('build_tests',
+  type: 'boolean',
+  value: false,
+  description: 'Build unit tests (automatically enabled for debug builds)')

scripts/build.sh

@@ -0,0 +1,162 @@
+#!/bin/bash
+
+# Build script for ptprnt - simplifies common build configurations
+# Usage: ./scripts/build.sh [release|debug|clean] [options]
+
+set -e
+
+SCRIPT_PATH="$( cd -- "$(dirname "$0")" >/dev/null 2>&1 ; pwd -P )"
+PROJECT_ROOT="${SCRIPT_PATH}/.."
+
+# Color output
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+BLUE='\033[0;34m'
+NC='\033[0m' # No Color
+
+print_usage() {
+    echo "Usage: $0 [build-type] [options]"
+    echo ""
+    echo "Build Types:"
+    echo "  release    Build optimized release version (default)"
+    echo "  debug      Build debug version with symbols"
+    echo "  clean      Clean build directories"
+    echo ""
+    echo "Options:"
+    echo "  --coverage Enable coverage reporting (debug builds only)"
+    echo "  --reconfigure  Force reconfiguration"
+    echo "  --test     Run tests after building"
+    echo "  -j N       Use N parallel jobs (default: auto)"
+    echo ""
+    echo "Examples:"
+    echo "  $0                    # Build release"
+    echo "  $0 debug --test       # Build debug and run tests"
+    echo "  $0 debug --coverage   # Build debug with coverage"
+    echo "  $0 clean              # Clean all build directories"
+}
+
+# Default values
+BUILD_TYPE="release"
+BUILDDIR="builddir"
+COVERAGE=false
+RECONFIGURE=false
+RUN_TESTS=false
+JOBS=""
+
+# Parse arguments
+while [[ $# -gt 0 ]]; do
+    case $1 in
+        release|debug|clean)
+            BUILD_TYPE="$1"
+            shift
+            ;;
+        --coverage)
+            COVERAGE=true
+            shift
+            ;;
+        --reconfigure)
+            RECONFIGURE=true
+            shift
+            ;;
+        --test)
+            RUN_TESTS=true
+            shift
+            ;;
+        -j)
+            JOBS="-j $2"
+            shift 2
+            ;;
+        -h|--help)
+            print_usage
+            exit 0
+            ;;
+        *)
+            echo -e "${RED}Error: Unknown option: $1${NC}"
+            print_usage
+            exit 1
+            ;;
+    esac
+done
+
+cd "${PROJECT_ROOT}"
+
+# Handle clean
+if [[ "${BUILD_TYPE}" == "clean" ]]; then
+    echo -e "${YELLOW}Cleaning build directories...${NC}"
+    rm -rf builddir builddir-debug
+    echo -e "${GREEN}Clean complete!${NC}"
+    exit 0
+fi
+
+# Set build directory and options based on build type
+if [[ "${BUILD_TYPE}" == "debug" ]]; then
+    BUILDDIR="builddir-debug"
+    MESON_OPTS="--buildtype=debug"
+
+    if [[ "${COVERAGE}" == true ]]; then
+        MESON_OPTS="${MESON_OPTS} -Db_coverage=true"
+        echo -e "${BLUE}Building debug with coverage enabled${NC}"
+    else
+        echo -e "${BLUE}Building debug version${NC}"
+    fi
+else
+    BUILDDIR="builddir"
+    MESON_OPTS="--buildtype=release"
+
+    if [[ "${COVERAGE}" == true ]]; then
+        echo -e "${YELLOW}Warning: Coverage is only supported for debug builds, ignoring --coverage${NC}"
+    fi
+
+    if [[ "${RUN_TESTS}" == true ]]; then
+        echo -e "${YELLOW}Warning: Tests are not built for release builds (use debug build for testing)${NC}"
+        RUN_TESTS=false
+    fi
+
+    echo -e "${BLUE}Building release version (tests disabled)${NC}"
+fi
+
+# Setup or reconfigure build directory
+if [[ ! -d "${BUILDDIR}" ]] || [[ "${RECONFIGURE}" == true ]]; then
+    if [[ "${RECONFIGURE}" == true ]]; then
+        echo -e "${YELLOW}Reconfiguring build...${NC}"
+        meson setup "${BUILDDIR}" ${MESON_OPTS} --wipe --reconfigure
+    else
+        echo -e "${YELLOW}Setting up build directory...${NC}"
+        meson setup "${BUILDDIR}" ${MESON_OPTS}
+    fi
+fi
+
+# Build
+echo -e "${YELLOW}Building...${NC}"
+ninja -C "${BUILDDIR}" ${JOBS}
+
+if [[ $? -eq 0 ]]; then
+    echo -e "${GREEN}Build successful!${NC}"
+    echo -e "Binary: ${BUILDDIR}/ptprnt"
+else
+    echo -e "${RED}Build failed!${NC}"
+    exit 1
+fi
+
+# Run tests if requested
+if [[ "${RUN_TESTS}" == true ]]; then
+    echo -e "${YELLOW}Running tests...${NC}"
+    ninja -C "${BUILDDIR}" test
+
+    if [[ $? -eq 0 ]]; then
+        echo -e "${GREEN}All tests passed!${NC}"
+    else
+        echo -e "${RED}Tests failed!${NC}"
+        exit 1
+    fi
+fi
+
+# Show binary info
+echo ""
+echo -e "${BLUE}Build Information:${NC}"
+echo "  Build type: ${BUILD_TYPE}"
+echo "  Build dir:  ${BUILDDIR}"
+echo "  Binary:     $(ls -lh ${BUILDDIR}/ptprnt | awk '{print $5, $9}')"
+echo ""
+echo -e "${GREEN}Done!${NC}"

scripts/generate_coverage.sh

@@ -0,0 +1,195 @@
+#!/bin/bash
+
+# Coverage report generator for ptprnt
+# Usage: ./scripts/generate_coverage.sh [options]
+
+set -e
+
+SCRIPT_PATH="$( cd -- "$(dirname "$0")" >/dev/null 2>&1 ; pwd -P )"
+PROJECT_ROOT="${SCRIPT_PATH}/.."
+
+# Output paths
+HTML_COV_PATH="coverageReport/html"
+XML_COV_PATH="coverageReport/xml"
+TEXT_COV_PATH="coverageReport"
+HTML_START_FILE="index.html"
+
+# Color output
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+BLUE='\033[0;34m'
+NC='\033[0m' # No Color
+
+# Default values - all formats enabled by default
+GENERATE_HTML=false
+GENERATE_XML=false
+GENERATE_TEXT=false
+BUILDDIR="builddir-debug"
+
+# Common gcovr options
+GCOVR_OPTS="--filter src --root ."
+
+print_usage() {
+    echo "Usage: $0 [options]"
+    echo ""
+    echo "Coverage Report Generator - generates coverage reports from existing coverage data"
+    echo ""
+    echo "Prerequisites:"
+    echo "  Build with coverage enabled first:"
+    echo "    ./scripts/build.sh debug --coverage --test"
+    echo ""
+    echo "Format Options (if none specified, all formats are generated):"
+    echo "  --html         Generate HTML coverage report"
+    echo "  --xml          Generate XML coverage report (for CI/CD)"
+    echo "  --text         Generate text coverage report (terminal output)"
+    echo ""
+    echo "Build Options:"
+    echo "  --builddir DIR Use custom build directory (default: builddir-debug)"
+    echo ""
+    echo "Other Options:"
+    echo "  -h, --help     Show this help message"
+    echo ""
+    echo "Examples:"
+    echo "  $0                        # Generate all formats (html, xml, text)"
+    echo "  $0 --html                 # Generate only HTML report"
+    echo "  $0 --html --text          # Generate HTML and text reports"
+    echo "  $0 --xml                  # Generate XML for CI/CD"
+    echo "  $0 --builddir builddir    # Use release build directory"
+}
+
+# Parse arguments
+# If no format arguments provided, enable all
+if [[ $# -eq 0 ]]; then
+    GENERATE_HTML=true
+    GENERATE_XML=true
+    GENERATE_TEXT=true
+fi
+
+while [[ $# -gt 0 ]]; do
+    case $1 in
+        --html)
+            GENERATE_HTML=true
+            shift
+            ;;
+        --xml)
+            GENERATE_XML=true
+            shift
+            ;;
+        --text)
+            GENERATE_TEXT=true
+            shift
+            ;;
+        --builddir)
+            BUILDDIR="$2"
+            shift 2
+            ;;
+        -h|--help)
+            print_usage
+            exit 0
+            ;;
+        *)
+            echo -e "${RED}Error: Unknown option: $1${NC}"
+            print_usage
+            exit 1
+            ;;
+    esac
+done
+
+# Check if any format was selected when arguments were provided
+if [[ $GENERATE_HTML == false && $GENERATE_XML == false && $GENERATE_TEXT == false ]]; then
+    echo -e "${RED}Error: No output format specified. Use --html, --xml, and/or --text${NC}"
+    print_usage
+    exit 1
+fi
+
+cd "${PROJECT_ROOT}"
+
+# Check if build directory exists
+if [[ ! -d "${BUILDDIR}" ]]; then
+    echo -e "${RED}Error: Build directory '${BUILDDIR}' does not exist${NC}"
+    echo ""
+    echo "Build with coverage enabled first:"
+    echo "  ./scripts/build.sh debug --coverage --test"
+    exit 1
+fi
+
+# Check if coverage data exists by looking for .gcda files
+if ! find "${BUILDDIR}" -name "*.gcda" -print -quit | grep -q .; then
+    echo -e "${RED}Error: No coverage data found in '${BUILDDIR}'${NC}"
+    echo ""
+    echo "Make sure you built with coverage enabled and ran the tests:"
+    echo "  ./scripts/build.sh debug --coverage --test"
+    exit 1
+fi
+
+echo -e "${BLUE}Generating Coverage report for ptprnt${NC}"
+echo "Build directory: ${BUILDDIR}"
+echo "Formats: $(${GENERATE_HTML} && echo -n "html ")$(${GENERATE_XML} && echo -n "xml ")$(${GENERATE_TEXT} && echo -n "text")"
+echo ""
+
+# Check if gcovr is available
+if ! command -v gcovr &> /dev/null; then
+    echo -e "${RED}Error: gcovr is not installed${NC}"
+    exit 1
+fi
+
+if [[ "${GENERATE_HTML}" == true ]]; then
+    echo -e "${YELLOW}Generating HTML coverage report...${NC}"
+    mkdir -p "${HTML_COV_PATH}"
+    gcovr ${GCOVR_OPTS} \
+        --html --html-details --html-syntax-highlighting \
+        --output "${HTML_COV_PATH}/${HTML_START_FILE}"
+
+    if [[ $? -eq 0 ]]; then
+        echo -e "${GREEN}✓ HTML report generated${NC}"
+        echo ""
+        echo -e "${BLUE}To view HTML report, open:${NC}"
+        echo "  file://${SCRIPT_PATH}/../${HTML_COV_PATH}/${HTML_START_FILE}"
+
+    else
+        echo -e "${RED}✗ HTML report failed${NC}"
+    fi
+fi
+
+if [[ "${GENERATE_XML}" == true ]]; then
+    echo -e "${YELLOW}Generating XML coverage report...${NC}"
+    mkdir -p "${XML_COV_PATH}"
+    gcovr ${GCOVR_OPTS} \
+        --xml-pretty \
+        --output "${XML_COV_PATH}/cov.xml"
+
+    if [[ $? -eq 0 ]]; then
+        echo -e "${GREEN}✓ XML report generated${NC}"
+          echo ""
+        echo -e "${BLUE}To view XML report, open:${NC}"
+        echo "  file://${SCRIPT_PATH}/../${XML_COV_PATH}/cov.xml"
+    else
+        echo -e "${RED}✗ XML report failed${NC}"
+    fi
+fi
+
+if [[ "${GENERATE_TEXT}" == true ]]; then
+    echo -e "${YELLOW}Generating text coverage report...${NC}"
+    mkdir -p "${TEXT_COV_PATH}"
+
+    # Save to file
+    gcovr ${GCOVR_OPTS} --output "${TEXT_COV_PATH}/coverage.txt"
+
+    if [[ $? -eq 0 ]]; then
+        echo -e "${GREEN}✓ Text report generated${NC}"
+        echo ""
+        echo -e "${BLUE}To view TXT report, open:${NC}"
+        echo "file://${SCRIPT_PATH}/../${TEXT_COV_PATH}/coverage.txt"
+    else
+        echo -e "${RED}✗ Text report failed${NC}"
+    fi
+fi
+
+# Clean up gcov files
+rm -f *.gcov 2>/dev/null
+
+# Summary
+echo ""
+echo -e "${GREEN}Coverage reports generated successfully!${NC}"
+echo ""

src/PtouchPrint.cpp

@@ -18,7 +18,8 @@
  */
 #include "PtouchPrint.hpp"
 
-#include <fmt/core.h>
+#include <format>
+#include <iostream>
 #include <spdlog/sinks/basic_file_sink.h>
 #include <spdlog/sinks/stdout_color_sinks.h>
 #include <spdlog/spdlog.h>
@@ -104,11 +105,11 @@ bool PtouchPrint::handleListDrivers() {
     auto driverFactory = std::make_unique<PrinterDriverFactory>();
     auto drivers       = driverFactory->listAllDrivers();
 
-    fmt::print("Available printer drivers:\n");
+    std::cout << "Available printer drivers:\n";
     for (const auto& driver : drivers) {
-        fmt::print("  - {}\n", driver);
+        std::cout << std::format("  - {}\n", driver);
     }
-    fmt::print("\nUse with: -p <driver_name> or --printer <driver_name>\n");
+    std::cout << "\nUse with: -p <driver_name> or --printer <driver_name>\n";
     return true;
 }
 

src/cli/CliParser.cpp

@@ -19,7 +19,8 @@
 
 #include "CliParser.hpp"
 
-#include <fmt/core.h>
+#include <format>
+#include <iostream>
 
 namespace ptprnt::cli {
 
@@ -92,7 +93,7 @@ void CliParser::reorderCommandsByArgv(int argc, char** argv) {
 void CliParser::setupParser() {
     // Version callback
     auto printVersion = [this](std::size_t) {
-        fmt::print("ptprnt version: {}\n", mVersionString);
+        std::cout << std::format("ptprnt version: {}\n", mVersionString);
         throw CLI::CallForVersion();
     };
 

src/core/PrinterService.cpp

@@ -22,13 +22,19 @@
 #include <spdlog/spdlog.h>
 
 #include "core/PrinterDriverFactory.hpp"
+#include "libusbwrap/UsbDeviceFactory.hpp"
 
 namespace ptprnt::core {
 
-PrinterService::PrinterService() = default;
+// Default constructor delegates to DI constructor
+PrinterService::PrinterService() : PrinterService(std::make_unique<libusbwrap::UsbDeviceFactory>()) {}
+
+// Constructor with dependency injection
+PrinterService::PrinterService(std::unique_ptr<libusbwrap::IUsbDeviceFactory> usbFactory)
+    : mUsbDeviceFactory(std::move(usbFactory)) {}
 
 bool PrinterService::initialize() {
-    if (!mUsbDeviceFactory.init()) {
+    if (!mUsbDeviceFactory->init()) {
         spdlog::error("Could not initialize libusb");
         return false;
     }
@@ -38,7 +44,7 @@ bool PrinterService::initialize() {
 std::vector<std::shared_ptr<IPrinterDriver>> PrinterService::detectPrinters() {
     spdlog::debug("Detecting printers...");
 
-    auto usbDevs       = mUsbDeviceFactory.findAllDevices();
+    auto usbDevs       = mUsbDeviceFactory->findAllDevices();
     auto driverFactory = std::make_unique<PrinterDriverFactory>();
     mDetectedPrinters.clear();
 

src/core/PrinterService.hpp

@@ -24,7 +24,7 @@
 #include <vector>
 
 #include "interface/IPrinterService.hpp"
-#include "libusbwrap/UsbDeviceFactory.hpp"
+#include "libusbwrap/interface/IUsbDeviceFactory.hpp"
 #include "printers/interface/IPrinterDriver.hpp"
 
 namespace ptprnt::core {
@@ -40,7 +40,12 @@ namespace ptprnt::core {
  */
 class PrinterService : public IPrinterService {
    public:
+    // Default constructor (uses real UsbDeviceFactory)
     PrinterService();
+
+    // Constructor for testing (inject mock factory)
+    explicit PrinterService(std::unique_ptr<libusbwrap::IUsbDeviceFactory> usbFactory);
+
     ~PrinterService() override = default;
 
     PrinterService(const PrinterService&)            = delete;
@@ -81,7 +86,7 @@ class PrinterService : public IPrinterService {
     bool printLabel(std::unique_ptr<graphics::ILabel> label) override;
 
    private:
-    libusbwrap::UsbDeviceFactory mUsbDeviceFactory;
+    std::unique_ptr<libusbwrap::IUsbDeviceFactory> mUsbDeviceFactory;
     std::vector<std::shared_ptr<IPrinterDriver>> mDetectedPrinters;
     std::shared_ptr<IPrinterDriver> mCurrentPrinter;
 };

src/graphics/Label.cpp

@@ -25,6 +25,7 @@
 #include <cassert>
 #include <cstddef>
 #include <cstdint>
+#include <cstring>
 #include <memory>
 #include <string>
 #include <vector>
@@ -274,7 +275,7 @@ bool Label::append(const ILabel& other, uint32_t spacingPx) {
     int newStride          = mCairoWrapper->cairo_image_surface_get_stride(newSurface.get());
 
     // Clear the new surface (set to transparent/white)
-    std::memset(newData, 0x00, newStride * height);
+    memset(newData, 0x00, newStride * height);
 
     // Copy current label data
     for (int y = 0; y < height; ++y) {

src/libusbwrap/LibUsbWrapper.cpp

@@ -0,0 +1,108 @@
+/*
+    ptrnt - print labels on linux
+    Copyright (C) 2025  Moritz Martinius
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+ */
+
+#include "LibUsbWrapper.hpp"
+
+#include "libusb.h"
+
+namespace libusbwrap {
+
+// LibUsbDeviceDeleter
+void LibUsbDeviceDeleter::operator()(libusb_device* dev) const {
+    if (dev && wrapper) {
+        wrapper->unrefDevice(dev);
+    }
+}
+
+// LibUsbWrapper
+
+int LibUsbWrapper::init(libusb_context** ctx) {
+    return libusb_init(ctx);
+}
+
+void LibUsbWrapper::exit(libusb_context* ctx) {
+    libusb_exit(ctx);
+}
+
+ssize_t LibUsbWrapper::getDeviceList(libusb_context* ctx, libusb_device*** list) {
+    return libusb_get_device_list(ctx, list);
+}
+
+void LibUsbWrapper::freeDeviceList(libusb_device** list, int unrefDevices) {
+    libusb_free_device_list(list, unrefDevices);
+}
+
+void LibUsbWrapper::refDevice(libusb_device* dev) {
+    libusb_ref_device(dev);
+}
+
+void LibUsbWrapper::unrefDevice(libusb_device* dev) {
+    libusb_unref_device(dev);
+}
+
+int LibUsbWrapper::getDeviceDescriptor(libusb_device* dev, libusb_device_descriptor* desc) {
+    return libusb_get_device_descriptor(dev, desc);
+}
+
+int LibUsbWrapper::open(libusb_device* dev, libusb_device_handle** handle) {
+    return libusb_open(dev, handle);
+}
+
+void LibUsbWrapper::close(libusb_device_handle* handle) {
+    libusb_close(handle);
+}
+
+int LibUsbWrapper::getSpeed(libusb_device* dev) {
+    return libusb_get_device_speed(dev);
+}
+
+uint8_t LibUsbWrapper::getBusNumber(libusb_device* dev) {
+    return libusb_get_bus_number(dev);
+}
+
+uint8_t LibUsbWrapper::getPortNumber(libusb_device* dev) {
+    return libusb_get_port_number(dev);
+}
+
+int LibUsbWrapper::kernelDriverActive(libusb_device_handle* handle, int interfaceNo) {
+    return libusb_kernel_driver_active(handle, interfaceNo);
+}
+
+int LibUsbWrapper::detachKernelDriver(libusb_device_handle* handle, int interfaceNo) {
+    return libusb_detach_kernel_driver(handle, interfaceNo);
+}
+
+int LibUsbWrapper::claimInterface(libusb_device_handle* handle, int interfaceNo) {
+    return libusb_claim_interface(handle, interfaceNo);
+}
+
+int LibUsbWrapper::releaseInterface(libusb_device_handle* handle, int interfaceNo) {
+    return libusb_release_interface(handle, interfaceNo);
+}
+
+int LibUsbWrapper::bulkTransfer(libusb_device_handle* handle, uint8_t endpoint, unsigned char* data, int length,
+                                int* transferred, unsigned int timeout) {
+    return libusb_bulk_transfer(handle, endpoint, data, length, transferred, timeout);
+}
+
+const char* LibUsbWrapper::errorName(int errorCode) {
+    return libusb_error_name(errorCode);
+}
+
+}  // namespace libusbwrap

src/libusbwrap/LibUsbWrapper.hpp

@@ -0,0 +1,125 @@
+/*
+    ptrnt - print labels on linux
+    Copyright (C) 2025  Moritz Martinius
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+ */
+
+#pragma once
+
+#include <cstdint>
+#include <memory>
+
+// Forward declarations to avoid pulling in libusb.h in header
+struct libusb_context;
+struct libusb_device;
+struct libusb_device_handle;
+struct libusb_device_descriptor;
+
+namespace libusbwrap {
+
+// Forward declaration
+class ILibUsbWrapper;
+
+// Custom deleter for libusb_device that uses the wrapper
+struct LibUsbDeviceDeleter {
+    std::shared_ptr<ILibUsbWrapper> wrapper;
+    void operator()(libusb_device* dev) const;
+};
+
+using LibUsbDevicePtr = std::unique_ptr<libusb_device, LibUsbDeviceDeleter>;
+
+/**
+ * @brief Thin wrapper around libusb C API
+ *
+ * This class provides a 1:1 mapping to libusb C functions.
+ */
+class ILibUsbWrapper {
+   public:
+    virtual ~ILibUsbWrapper() = default;
+
+    // Context management (raw pointers - caller manages lifecycle)
+    virtual int init(libusb_context** ctx) = 0;
+    virtual void exit(libusb_context* ctx) = 0;
+
+    // Device enumeration (raw pointers - caller manages lifecycle)
+    virtual ssize_t getDeviceList(libusb_context* ctx, libusb_device*** list) = 0;
+    virtual void freeDeviceList(libusb_device** list, int unrefDevices)       = 0;
+    virtual void refDevice(libusb_device* dev)                                = 0;
+    virtual void unrefDevice(libusb_device* dev)                              = 0;
+
+    // Device descriptor
+    virtual int getDeviceDescriptor(libusb_device* dev, libusb_device_descriptor* desc) = 0;
+
+    // Device opening/closing (raw pointers - caller manages lifecycle)
+    virtual int open(libusb_device* dev, libusb_device_handle** handle) = 0;
+    virtual void close(libusb_device_handle* handle)                    = 0;
+
+    // Device information
+    virtual int getSpeed(libusb_device* dev)          = 0;
+    virtual uint8_t getBusNumber(libusb_device* dev)  = 0;
+    virtual uint8_t getPortNumber(libusb_device* dev) = 0;
+
+    // Kernel driver management
+    virtual int kernelDriverActive(libusb_device_handle* handle, int interfaceNo) = 0;
+    virtual int detachKernelDriver(libusb_device_handle* handle, int interfaceNo) = 0;
+
+    // Interface management
+    virtual int claimInterface(libusb_device_handle* handle, int interfaceNo)   = 0;
+    virtual int releaseInterface(libusb_device_handle* handle, int interfaceNo) = 0;
+
+    // Data transfer
+    virtual int bulkTransfer(libusb_device_handle* handle, uint8_t endpoint, unsigned char* data, int length,
+                             int* transferred, unsigned int timeout) = 0;
+
+    // Error handling
+    virtual const char* errorName(int errorCode) = 0;
+};
+
+/**
+ * @brief Concrete implementation - thin wrapper forwarding to libusb C API
+ */
+class LibUsbWrapper : public ILibUsbWrapper {
+   public:
+    int init(libusb_context** ctx) override;
+    void exit(libusb_context* ctx) override;
+
+    ssize_t getDeviceList(libusb_context* ctx, libusb_device*** list) override;
+    void freeDeviceList(libusb_device** list, int unrefDevices) override;
+    void refDevice(libusb_device* dev) override;
+    void unrefDevice(libusb_device* dev) override;
+
+    int getDeviceDescriptor(libusb_device* dev, libusb_device_descriptor* desc) override;
+
+    int open(libusb_device* dev, libusb_device_handle** handle) override;
+    void close(libusb_device_handle* handle) override;
+
+    int getSpeed(libusb_device* dev) override;
+    uint8_t getBusNumber(libusb_device* dev) override;
+    uint8_t getPortNumber(libusb_device* dev) override;
+
+    int kernelDriverActive(libusb_device_handle* handle, int interfaceNo) override;
+    int detachKernelDriver(libusb_device_handle* handle, int interfaceNo) override;
+
+    int claimInterface(libusb_device_handle* handle, int interfaceNo) override;
+    int releaseInterface(libusb_device_handle* handle, int interfaceNo) override;
+
+    int bulkTransfer(libusb_device_handle* handle, uint8_t endpoint, unsigned char* data, int length, int* transferred,
+                     unsigned int timeout) override;
+
+    const char* errorName(int errorCode) override;
+};
+
+}  // namespace libusbwrap

src/libusbwrap/UsbDevice.cpp

@@ -24,44 +24,55 @@
 
 #include "libusb.h"
 #include "libusbwrap/LibUsbTypes.hpp"
+#include "libusbwrap/LibUsbWrapper.hpp"
 #include "libusbwrap/interface/IUsbDevice.hpp"
 
 namespace libusbwrap {
-UsbDevice::UsbDevice(libusb_context* ctx, usbDevice_ptr dev) : mLibusbCtx(ctx), mLibusbDev(std::move(dev)) {
-    if (mLibusbCtx == nullptr || mLibusbDev == nullptr) {
-        throw std::invalid_argument("ctx or device are nullptr");
-    }
 
-    libusb_get_device_descriptor(mLibusbDev.get(), &mLibusbDevDesc);
+// Default constructor delegates to DI constructor
+UsbDevice::UsbDevice(libusb_device* device, const libusb_device_descriptor& desc)
+    : UsbDevice(device, desc, std::make_shared<LibUsbWrapper>()) {}
+
+// Constructor with dependency injection
+UsbDevice::UsbDevice(libusb_device* device, const libusb_device_descriptor& desc,
+                     std::shared_ptr<ILibUsbWrapper> libusbWrapper)
+    : mLibUsb(libusbWrapper), mDevice(device, LibUsbDeviceDeleter{libusbWrapper}), mDeviceDescriptor(desc) {
+    if (!mDevice) {
+        throw std::invalid_argument("device is nullptr");
+    }
 }
 
 UsbDevice::~UsbDevice() {
-    // only free the device, not the context, which is shared between every device
+    if (mIsOpen && mDeviceHandle) {
-    // the UsbDeviceFactory will take care of that
+        mLibUsb->close(mDeviceHandle);
-    if (mIsOpen) {
-        close();
     }
+    // mDevice auto-deleted by unique_ptr (calls LibUsbDeviceDeleter)
 }
 
 bool UsbDevice::open() {
-    int openStatus = libusb_open(mLibusbDev.get(), &mLibusbDevHandle);
+    int openStatus = mLibUsb->open(mDevice.get(), &mDeviceHandle);
     if (openStatus != 0) {
         mLastError = static_cast<Error>(openStatus);
         return false;
     }
 
+    mIsOpen = true;
     return true;
 }
 
 void UsbDevice::close() {
-    libusb_close(mLibusbDevHandle);
+    if (mDeviceHandle) {
+        mLibUsb->close(mDeviceHandle);
+        mDeviceHandle = nullptr;
+        mIsOpen       = false;
+    }
 }
 
 bool UsbDevice::detachKernelDriver(int interfaceNo) {
     // TODO: cover the other status codes that can be returned
-    int kernelDriverStatus = libusb_kernel_driver_active(mLibusbDevHandle, interfaceNo);
+    int kernelDriverStatus = mLibUsb->kernelDriverActive(mDeviceHandle, interfaceNo);
     if (kernelDriverStatus == 1) {  // kernel driver is active, we have to detach to continue...
-        int detachStatus = libusb_detach_kernel_driver(mLibusbDevHandle, interfaceNo);
+        int detachStatus = mLibUsb->detachKernelDriver(mDeviceHandle, interfaceNo);
         if (detachStatus != 0) {
             mLastError = static_cast<Error>(detachStatus);
             return false;
@@ -73,7 +84,7 @@ bool UsbDevice::detachKernelDriver(int interfaceNo) {
 
 bool UsbDevice::claimInterface(int interfaceNo) {
     // TODO: cover the other status codes that can be returned
-    int claimInterfaceStatus = libusb_claim_interface(mLibusbDevHandle, interfaceNo);
+    int claimInterfaceStatus = mLibUsb->claimInterface(mDeviceHandle, interfaceNo);
     if (claimInterfaceStatus != 0) {
         mLastError = static_cast<Error>(claimInterfaceStatus);
         return false;
@@ -82,7 +93,7 @@ bool UsbDevice::claimInterface(int interfaceNo) {
 }
 
 bool UsbDevice::releaseInterface(int interfaceNo) {
-    int releaseInterfaceStatus = libusb_release_interface(mLibusbDevHandle, interfaceNo);
+    int releaseInterfaceStatus = mLibUsb->releaseInterface(mDeviceHandle, interfaceNo);
     if (releaseInterfaceStatus != 0) {
         mLastError = static_cast<Error>(releaseInterfaceStatus);
         return false;
@@ -92,10 +103,8 @@ bool UsbDevice::releaseInterface(int interfaceNo) {
 
 bool UsbDevice::bulkTransfer(uint8_t endpoint, const std::vector<uint8_t>& data, int* tx, unsigned int timeout) {
     // TODO: implement error handling for incomplete transactions (tx length != data length)
-    int bulkTransferStatus = 0;
+    int bulkTransferStatus = mLibUsb->bulkTransfer(mDeviceHandle, endpoint, const_cast<unsigned char*>(data.data()),
-
+                                                   data.size(), tx, timeout);
-    bulkTransferStatus = libusb_bulk_transfer(mLibusbDevHandle, endpoint, const_cast<unsigned char*>(data.data()),
-                                              data.size(), tx, timeout);
     if (bulkTransferStatus != 0) {
         mLastError = static_cast<Error>(bulkTransferStatus);
         return false;
@@ -104,19 +113,19 @@ bool UsbDevice::bulkTransfer(uint8_t endpoint, const std::vector<uint8_t>& data,
 }
 
 const usbId UsbDevice::getUsbId() {
-    return {mLibusbDevDesc.idVendor, mLibusbDevDesc.idProduct};
+    return {mDeviceDescriptor.idVendor, mDeviceDescriptor.idProduct};
 }
 
 const device::Speed UsbDevice::getSpeed() {
-    return static_cast<device::Speed>(libusb_get_device_speed(mLibusbDev.get()));
+    return static_cast<device::Speed>(mLibUsb->getSpeed(mDevice.get()));
 }
 
 const uint8_t UsbDevice::getBusNumber() {
-    return libusb_get_bus_number(mLibusbDev.get());
+    return mLibUsb->getBusNumber(mDevice.get());
 }
 
 const uint8_t UsbDevice::getPortNumber() {
-    return libusb_get_port_number(mLibusbDev.get());
+    return mLibUsb->getPortNumber(mDevice.get());
 }
 
 const Error UsbDevice::getLastError() {
@@ -124,6 +133,6 @@ const Error UsbDevice::getLastError() {
 }
 
 const std::string UsbDevice::getLastErrorString() {
-    return std::string(libusb_error_name(static_cast<int>(mLastError)));
+    return std::string(mLibUsb->errorName(static_cast<int>(mLastError)));
 }
 }  // namespace libusbwrap

src/libusbwrap/UsbDevice.hpp

@@ -24,23 +24,20 @@
 
 #include "libusb.h"
 #include "libusbwrap/LibUsbTypes.hpp"
+#include "libusbwrap/LibUsbWrapper.hpp"
 #include "libusbwrap/interface/IUsbDevice.hpp"
 
 namespace libusbwrap {
 
-struct usbDevice_deleter {
-    void operator()(libusb_device* dev_ptr) const {
-        if (nullptr != dev_ptr) {
-            libusb_unref_device(dev_ptr);
-        }
-    }
-};
-
-using usbDevice_ptr = std::unique_ptr<libusb_device, usbDevice_deleter>;
-
 class UsbDevice : public IUsbDevice {
    public:
-    explicit UsbDevice(libusb_context* ctx, usbDevice_ptr dev);
+    // Default constructor (uses real LibUsbWrapper)
+    UsbDevice(libusb_device* device, const libusb_device_descriptor& desc);
+
+    // Constructor for testing (inject mock wrapper)
+    UsbDevice(libusb_device* device, const libusb_device_descriptor& desc,
+              std::shared_ptr<ILibUsbWrapper> libusbWrapper);
+
     ~UsbDevice() override;
 
     // delete copy ctor and assignment
@@ -69,10 +66,13 @@ class UsbDevice : public IUsbDevice {
     const std::string getLastErrorString() override;
 
    private:
-    libusb_context* mLibusbCtx{nullptr};
+    std::shared_ptr<ILibUsbWrapper> mLibUsb;  // Injectable wrapper
-    usbDevice_ptr mLibusbDev{nullptr};
+
-    libusb_device_handle* mLibusbDevHandle{nullptr};
+    // RAII wrappers (UsbDevice owns the lifecycle logic)
-    libusb_device_descriptor mLibusbDevDesc{0};
+    LibUsbDevicePtr mDevice;                        // unique_ptr with custom deleter
+    libusb_device_handle* mDeviceHandle = nullptr;  // Managed by UsbDevice (calls mLibUsb->close())
+
+    libusb_device_descriptor mDeviceDescriptor{0};
     std::atomic<bool> mIsOpen = false;
     Error mLastError          = Error::SUCCESS;
 };

src/libusbwrap/UsbDeviceFactory.cpp

@@ -27,16 +27,24 @@
 #include <vector>
 
 #include "libusb.h"
+#include "libusbwrap/LibUsbWrapper.hpp"
 #include "libusbwrap/UsbDevice.hpp"
 #include "libusbwrap/interface/IUsbDevice.hpp"
 
 namespace libusbwrap {
 
+// Default constructor delegates to DI constructor
+UsbDeviceFactory::UsbDeviceFactory() : UsbDeviceFactory(std::make_shared<LibUsbWrapper>()) {}
+
+// Constructor with dependency injection
+UsbDeviceFactory::UsbDeviceFactory(std::shared_ptr<ILibUsbWrapper> libusbWrapper) : mLibUsb(std::move(libusbWrapper)) {}
+
 UsbDeviceFactory::~UsbDeviceFactory() {
-    if (mLibusbCtx) {
+    mDeviceList.clear();  // Release devices first
-        libusb_exit(mLibusbCtx);
+    if (mContext) {
+        mLibUsb->exit(mContext);
     }
-};
+}
 
 std::vector<std::unique_ptr<IUsbDevice>> UsbDeviceFactory::findAllDevices() {
     refreshDeviceList();
@@ -51,46 +59,51 @@ std::vector<std::unique_ptr<IUsbDevice>> UsbDeviceFactory::findDevices(uint16_t
 ssize_t UsbDeviceFactory::refreshDeviceList() {
     libusb_device** list{nullptr};
 
-    ssize_t ret = libusb_get_device_list(mLibusbCtx, &list);
+    ssize_t count = mLibUsb->getDeviceList(mContext, &list);
-    mLibusbDeviceList.clear();
+    mDeviceList.clear();
-    if (ret < 0) {
+
-        spdlog::error("Error enumarating USB devices");
+    if (count < 0) {
-    } else if (ret == 0) {
+        spdlog::error("Error enumerating USB devices");
+    } else if (count == 0) {
         spdlog::warn("No USB devices found");
+    } else {
+        for (ssize_t i = 0; i < count; i++) {
+            mLibUsb->refDevice(list[i]);  // Increment refcount
+            // Create LibUsbDevicePtr with deleter that uses the wrapper
+            mDeviceList.emplace_back(list[i], LibUsbDeviceDeleter{mLibUsb});
+        }
     }
 
-    for (ssize_t i = 0; i < ret; i++) {
+    mLibUsb->freeDeviceList(list, false);  // Don't unref (we did that above)
-        mLibusbDeviceList.emplace_back(list[i]);
+    return count;
-    }
-
-    libusb_free_device_list(list, false);
-    return ret;
 }
 
 std::vector<std::unique_ptr<IUsbDevice>> UsbDeviceFactory::buildMaskedDeviceVector(uint16_t vidMask, uint16_t pidMask,
                                                                                    uint16_t vid, uint16_t pid) {
     std::vector<std::unique_ptr<IUsbDevice>> matchedDevices;
     // see libusb/examples/listdevs.c
-    for (auto& currDev : mLibusbDeviceList) {
+    for (auto& dev : mDeviceList) {
-        struct libusb_device_descriptor currDevDesc{};
+        libusb_device_descriptor desc{};
 
-        int ret = libusb_get_device_descriptor(currDev.get(), &currDevDesc);
+        int ret = mLibUsb->getDeviceDescriptor(dev.get(), &desc);
-        spdlog::trace("Detected Device {:04x}:{:04x} ", currDevDesc.idVendor, currDevDesc.idProduct);
+        spdlog::trace("Detected Device {:04x}:{:04x} ", desc.idVendor, desc.idProduct);
-        if (ret < 0) {
+
-            continue;
+        if (ret >= 0 && ((desc.idVendor & vidMask) == vid) && ((desc.idProduct & pidMask) == pid)) {
-        }
+            // Transfer ownership of device to UsbDevice
-        if (((currDevDesc.idVendor & vidMask) == vid) && ((currDevDesc.idProduct & pidMask) == pid)) {
+            libusb_device* raw_dev = dev.release();
-            matchedDevices.push_back(std::make_unique<UsbDevice>(mLibusbCtx, std::move(currDev)));
+
+            // Create UsbDevice with same wrapper instance
+            matchedDevices.push_back(std::make_unique<UsbDevice>(raw_dev, desc, mLibUsb));
         }
     }
     return matchedDevices;
 }
 
 bool UsbDeviceFactory::init() {
-    auto err = libusb_init(&mLibusbCtx);
+    int err = mLibUsb->init(&mContext);
 
     if (err != (int)Error::SUCCESS) {
-        spdlog::error("Could not intialize libusb");
+        spdlog::error("Could not initialize libusb");
         return false;
     }
 

src/libusbwrap/UsbDeviceFactory.hpp

@@ -20,8 +20,10 @@
 #pragma once
 
 #include <cstdint>
+#include <memory>
 
 #include "libusb.h"
+#include "libusbwrap/LibUsbWrapper.hpp"
 #include "libusbwrap/UsbDevice.hpp"
 #include "libusbwrap/interface/IUsbDeviceFactory.hpp"
 
@@ -31,7 +33,12 @@ constexpr const uint16_t LIBUSB_BITMASK_ALL = 0xffff;
 
 class UsbDeviceFactory : public IUsbDeviceFactory {
    public:
-    UsbDeviceFactory() = default;
+    // Default constructor (uses real LibUsbWrapper)
+    UsbDeviceFactory();
+
+    // Constructor for testing (inject mock wrapper)
+    explicit UsbDeviceFactory(std::shared_ptr<ILibUsbWrapper> libusbWrapper);
+
     virtual ~UsbDeviceFactory();
 
     // delete copy ctor and assignment
@@ -40,17 +47,17 @@ class UsbDeviceFactory : public IUsbDeviceFactory {
     UsbDeviceFactory(UsbDeviceFactory&&)            = delete;
     UsbDeviceFactory& operator=(UsbDeviceFactory&&) = delete;
 
-    bool init();
+    bool init() override;
     /**
      * @brief Gets all devices that are detected by libusb. Will allocate a shared_ptr for each Device
-     * 
+     *
      * @return std::vector<std::shared_ptr<IUsbDevice>> Vector of all detected USB devices
      */
     std::vector<std::unique_ptr<IUsbDevice>> findAllDevices() override;
     /**
-     * @brief Gets all devices with certain vid/pid combination. 
+     * @brief Gets all devices with certain vid/pid combination.
      *        If only one device of certain type is connected, vector is usually only one element
-     * 
+     *
      * @param vid VendorId of the devices to find
      * @param pid ProductId of the devices to find
      * @return std::vector<std::shared_ptr<IUsbDevice>> Vector of detected USB devices based on vid/pid
@@ -60,12 +67,12 @@ class UsbDeviceFactory : public IUsbDeviceFactory {
    private:
     // methods
     ssize_t refreshDeviceList();
-    std::vector<std::unique_ptr<IUsbDevice>> buildMaskedDeviceVector(uint16_t vidMask,
+    std::vector<std::unique_ptr<IUsbDevice>> buildMaskedDeviceVector(uint16_t vidMask, uint16_t pidMask, uint16_t vid,
-                                                                     uint16_t pidMask, uint16_t vid,
                                                                      uint16_t pid);
     // members
-    libusb_context* mLibusbCtx{nullptr};
+    std::shared_ptr<ILibUsbWrapper> mLibUsb;
-    std::vector<usbDevice_ptr> mLibusbDeviceList{};
+    libusb_context* mContext{nullptr};  // Factory manages lifecycle
+    std::vector<LibUsbDevicePtr> mDeviceList{};
     bool mDeviceListInitialized = false;
 };
 }  // namespace libusbwrap

src/libusbwrap/interface/IUsbDeviceFactory.hpp

@@ -29,6 +29,7 @@ namespace libusbwrap {
 class IUsbDeviceFactory {
    public:
     virtual ~IUsbDeviceFactory()                                                             = default;
+    virtual bool init()                                                                      = 0;
     virtual std::vector<std::unique_ptr<IUsbDevice>> findAllDevices()                        = 0;
     virtual std::vector<std::unique_ptr<IUsbDevice>> findDevices(uint16_t vid, uint16_t pid) = 0;
 };

src/meson.build

@@ -7,6 +7,7 @@ ptprnt_hpps = files(
     'graphics/LabelBuilder.hpp',
     'graphics/Monochrome.hpp',
     'libusbwrap/LibUsbTypes.hpp',
+    'libusbwrap/LibUsbWrapper.hpp',
     'libusbwrap/UsbDevice.hpp',
     'libusbwrap/UsbDeviceFactory.hpp',
     'libusbwrap/interface/IUsbDevice.hpp',
@@ -26,6 +27,7 @@ ptprnt_srcs = files(
     'graphics/Label.cpp',
     'graphics/LabelBuilder.cpp',
     'graphics/Monochrome.cpp',
+    'libusbwrap/LibUsbWrapper.cpp',
     'libusbwrap/UsbDevice.cpp',
     'libusbwrap/UsbDeviceFactory.cpp',
     'printers/FakePrinter.cpp',

src/printers/FakePrinter.cpp

@@ -113,6 +113,11 @@ bool FakePrinter::printMonochromeData(const graphics::MonochromeData& data) {
 }
 
 bool FakePrinter::printLabel(const std::unique_ptr<graphics::ILabel> label) {
+    if (!label) {
+        spdlog::error("FakePrinter: Cannot print null label");
+        return false;
+    }
+
     // Convert label directly to MonochromeData
     // getRaw() returns data in Cairo surface coordinates matching getWidth() × getHeight()
     auto pixels = label->getRaw();

src/printers/P700Printer.cpp

@@ -90,6 +90,11 @@ libusbwrap::usbId P700Printer::getUsbId() {
 }
 
 bool P700Printer::attachUsbDevice(std::shared_ptr<libusbwrap::IUsbDevice> usbHndl) {
+    if (!usbHndl) {
+        spdlog::error("Cannot attach null USB device");
+        return false;
+    }
+
     if (!usbHndl->open()) {
         spdlog::error("Unable to open USB device: {}", usbHndl->getLastErrorString());
         return false;
@@ -133,6 +138,10 @@ bool P700Printer::printBitmap(const graphics::Bitmap<graphics::ALPHA8>& bitmap)
 }
 
 bool P700Printer::printMonochromeData(const graphics::MonochromeData& data) {
+    if (!mUsbHndl) {
+        spdlog::error("USB Handle is invalid!");
+        return false;
+    }
     // Send initialization sequence
     // The INITIALIZE command needs to be sent as a 128-byte packet with ESC @ at the end
     std::vector<uint8_t> initCmd(128, 0x00);
@@ -182,6 +191,11 @@ bool P700Printer::printMonochromeData(const graphics::MonochromeData& data) {
 }
 
 bool P700Printer::printLabel(std::unique_ptr<graphics::ILabel> label) {
+    if (!label) {
+        spdlog::error("Cannot print null label");
+        return false;
+    }
+
     // Convert label directly to MonochromeData
     // getRaw() returns data in Cairo surface coordinates matching getWidth() × getHeight()
     auto pixels = label->getRaw();
@@ -200,9 +214,15 @@ bool P700Printer::printLabel(std::unique_ptr<graphics::ILabel> label) {
 }
 
 bool P700Printer::print() {
-    send(p700::commands::LF);
+    if (!send(p700::commands::LF)) {
-    send(p700::commands::FF);
+        return false;
-    send(p700::commands::EJECT);
+    }
+    if (!send(p700::commands::FF)) {
+        return false;
+    }
+    if (!send(p700::commands::EJECT)) {
+        return false;
+    }
     return true;
 }
 

subprojects/spdlog.wrap

@@ -0,0 +1,13 @@
+[wrap-file]
+directory = spdlog-1.15.3
+source_url = https://github.com/gabime/spdlog/archive/refs/tags/v1.15.3.tar.gz
+source_filename = spdlog-1.15.3.tar.gz
+source_hash = 15a04e69c222eb6c01094b5c7ff8a249b36bb22788d72519646fb85feb267e67
+source_fallback_url = https://github.com/mesonbuild/wrapdb/releases/download/spdlog_1.15.3-5/spdlog-1.15.3.tar.gz
+patch_filename = spdlog_1.15.3-5_patch.zip
+patch_url = https://wrapdb.mesonbuild.com/v2/spdlog_1.15.3-5/get_patch
+patch_hash = 5e0eaf0002ff589cd8dac58e1b38c297422e7a0404d7d47ff0d2e285ed18169c
+wrapdb_version = 1.15.3-5
+
+[provide]
+dependency_names = spdlog

test_copyright.cpp

@@ -1 +0,0 @@
-# Test file

tests/cli_parser_test/cli_parser_test.cpp

@@ -0,0 +1,365 @@
+/*
+    ptrnt - print labels on linux
+    Copyright (C) 2025  Moritz Martinius
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+ */
+
+#include <gtest/gtest.h>
+
+#include <cstring>
+#include <vector>
+
+#include "cli/CliParser.hpp"
+
+namespace ptprnt::cli {
+
+class CliParserTest : public ::testing::Test {
+   protected:
+    void SetUp() override {
+        parser = std::make_unique<CliParser>("Test Application", "v1.0.0");
+    }
+
+    void TearDown() override { parser.reset(); }
+
+    // Helper to convert vector of strings to argc/argv
+    std::vector<char*> makeArgv(const std::vector<std::string>& args) {
+        argv_storage.clear();
+        argv_storage.reserve(args.size());
+
+        for (const auto& arg : args) {
+            argv_storage.push_back(const_cast<char*>(arg.c_str()));
+        }
+
+        return argv_storage;
+    }
+
+    std::unique_ptr<CliParser> parser;
+    std::vector<char*> argv_storage;
+};
+
+// Test: Constructor
+TEST_F(CliParserTest, Constructor) {
+    EXPECT_NO_THROW(CliParser("App", "v1.0"));
+}
+
+// Test: Parse with no arguments
+TEST_F(CliParserTest, ParseNoArguments) {
+    std::vector<std::string> args = {"ptprnt"};
+    auto argv = makeArgv(args);
+
+    int result = parser->parse(args.size(), argv.data());
+
+    EXPECT_EQ(result, 0);
+    const auto& options = parser->getOptions();
+    EXPECT_FALSE(options.verbose);
+    EXPECT_FALSE(options.trace);
+    EXPECT_FALSE(options.listDrivers);
+    EXPECT_EQ(options.printerSelection, "auto");
+    EXPECT_TRUE(options.commands.empty());
+}
+
+// Test: Parse verbose flag
+TEST_F(CliParserTest, ParseVerboseShort) {
+    std::vector<std::string> args = {"ptprnt", "-v"};
+    auto argv = makeArgv(args);
+
+    int result = parser->parse(args.size(), argv.data());
+
+    EXPECT_EQ(result, 0);
+    EXPECT_TRUE(parser->getOptions().verbose);
+}
+
+TEST_F(CliParserTest, ParseVerboseLong) {
+    std::vector<std::string> args = {"ptprnt", "--verbose"};
+    auto argv = makeArgv(args);
+
+    int result = parser->parse(args.size(), argv.data());
+
+    EXPECT_EQ(result, 0);
+    EXPECT_TRUE(parser->getOptions().verbose);
+}
+
+// Test: Parse trace flag
+TEST_F(CliParserTest, ParseTrace) {
+    std::vector<std::string> args = {"ptprnt", "--trace"};
+    auto argv = makeArgv(args);
+
+    int result = parser->parse(args.size(), argv.data());
+
+    EXPECT_EQ(result, 0);
+    EXPECT_TRUE(parser->getOptions().trace);
+}
+
+// Test: Parse list drivers flag
+TEST_F(CliParserTest, ParseListDrivers) {
+    std::vector<std::string> args = {"ptprnt", "--list-all-drivers"};
+    auto argv = makeArgv(args);
+
+    int result = parser->parse(args.size(), argv.data());
+
+    EXPECT_EQ(result, 0);
+    EXPECT_TRUE(parser->getOptions().listDrivers);
+}
+
+// Test: Parse printer selection short
+TEST_F(CliParserTest, ParsePrinterShort) {
+    std::vector<std::string> args = {"ptprnt", "-p", "P700"};
+    auto argv = makeArgv(args);
+
+    int result = parser->parse(args.size(), argv.data());
+
+    EXPECT_EQ(result, 0);
+    EXPECT_EQ(parser->getOptions().printerSelection, "P700");
+}
+
+// Test: Parse printer selection long
+TEST_F(CliParserTest, ParsePrinterLong) {
+    std::vector<std::string> args = {"ptprnt", "--printer", "FakePrinter"};
+    auto argv = makeArgv(args);
+
+    int result = parser->parse(args.size(), argv.data());
+
+    EXPECT_EQ(result, 0);
+    EXPECT_EQ(parser->getOptions().printerSelection, "FakePrinter");
+}
+
+// Test: Parse single text
+TEST_F(CliParserTest, ParseSingleText) {
+    std::vector<std::string> args = {"ptprnt", "-t", "Hello"};
+    auto argv = makeArgv(args);
+
+    int result = parser->parse(args.size(), argv.data());
+
+    EXPECT_EQ(result, 0);
+    const auto& commands = parser->getOptions().commands;
+    ASSERT_EQ(commands.size(), 1);
+    EXPECT_EQ(commands[0].first, CommandType::Text);
+    EXPECT_EQ(commands[0].second, "Hello");
+}
+
+// Test: Parse multiple texts
+TEST_F(CliParserTest, ParseMultipleTexts) {
+    std::vector<std::string> args = {"ptprnt", "-t", "Hello", "-t", "World"};
+    auto argv = makeArgv(args);
+
+    int result = parser->parse(args.size(), argv.data());
+
+    EXPECT_EQ(result, 0);
+    const auto& commands = parser->getOptions().commands;
+    ASSERT_EQ(commands.size(), 2);
+    EXPECT_EQ(commands[0].first, CommandType::Text);
+    EXPECT_EQ(commands[0].second, "Hello");
+    EXPECT_EQ(commands[1].first, CommandType::Text);
+    EXPECT_EQ(commands[1].second, "World");
+}
+
+// Test: Parse font
+TEST_F(CliParserTest, ParseFont) {
+    std::vector<std::string> args = {"ptprnt", "-f", "monospace", "-t", "Test"};
+    auto argv = makeArgv(args);
+
+    int result = parser->parse(args.size(), argv.data());
+
+    EXPECT_EQ(result, 0);
+    const auto& commands = parser->getOptions().commands;
+    ASSERT_EQ(commands.size(), 2);
+    EXPECT_EQ(commands[0].first, CommandType::Font);
+    EXPECT_EQ(commands[0].second, "monospace");
+}
+
+// Test: Parse font size
+TEST_F(CliParserTest, ParseFontSize) {
+    std::vector<std::string> args = {"ptprnt", "-s", "48", "-t", "Large"};
+    auto argv = makeArgv(args);
+
+    int result = parser->parse(args.size(), argv.data());
+
+    EXPECT_EQ(result, 0);
+    const auto& commands = parser->getOptions().commands;
+    ASSERT_GE(commands.size(), 1);
+    EXPECT_EQ(commands[0].first, CommandType::FontSize);
+    EXPECT_EQ(commands[0].second, "48");
+}
+
+// Test: Parse horizontal alignment
+TEST_F(CliParserTest, ParseHAlign) {
+    std::vector<std::string> args = {"ptprnt", "--halign", "center", "-t", "Centered"};
+    auto argv = makeArgv(args);
+
+    int result = parser->parse(args.size(), argv.data());
+
+    EXPECT_EQ(result, 0);
+    const auto& commands = parser->getOptions().commands;
+    ASSERT_GE(commands.size(), 1);
+    EXPECT_EQ(commands[0].first, CommandType::HAlign);
+    EXPECT_EQ(commands[0].second, "center");
+}
+
+// Test: Parse vertical alignment
+TEST_F(CliParserTest, ParseVAlign) {
+    std::vector<std::string> args = {"ptprnt", "--valign", "top", "-t", "Top"};
+    auto argv = makeArgv(args);
+
+    int result = parser->parse(args.size(), argv.data());
+
+    EXPECT_EQ(result, 0);
+    const auto& commands = parser->getOptions().commands;
+    ASSERT_GE(commands.size(), 1);
+    EXPECT_EQ(commands[0].first, CommandType::VAlign);
+    EXPECT_EQ(commands[0].second, "top");
+}
+
+// Test: Parse new label flag
+TEST_F(CliParserTest, ParseNewLabel) {
+    std::vector<std::string> args = {"ptprnt", "-t", "First", "--new", "-t", "Second"};
+    auto argv = makeArgv(args);
+
+    int result = parser->parse(args.size(), argv.data());
+
+    EXPECT_EQ(result, 0);
+    const auto& commands = parser->getOptions().commands;
+    ASSERT_EQ(commands.size(), 3);
+    EXPECT_EQ(commands[0].first, CommandType::Text);
+    EXPECT_EQ(commands[1].first, CommandType::NewLabel);
+    EXPECT_EQ(commands[2].first, CommandType::Text);
+}
+
+// Test: Parse complex command sequence
+TEST_F(CliParserTest, ParseComplexSequence) {
+    std::vector<std::string> args = {
+        "ptprnt",
+        "-f", "serif",
+        "-s", "24",
+        "--halign", "center",
+        "--valign", "middle",
+        "-t", "Title",
+        "--new",
+        "-f", "monospace",
+        "-s", "16",
+        "-t", "Body"
+    };
+    auto argv = makeArgv(args);
+
+    int result = parser->parse(args.size(), argv.data());
+
+    EXPECT_EQ(result, 0);
+    const auto& commands = parser->getOptions().commands;
+    ASSERT_EQ(commands.size(), 9);
+
+    // Verify order is preserved
+    EXPECT_EQ(commands[0].first, CommandType::Font);
+    EXPECT_EQ(commands[1].first, CommandType::FontSize);
+    EXPECT_EQ(commands[2].first, CommandType::HAlign);
+    EXPECT_EQ(commands[3].first, CommandType::VAlign);
+    EXPECT_EQ(commands[4].first, CommandType::Text);
+    EXPECT_EQ(commands[5].first, CommandType::NewLabel);
+    EXPECT_EQ(commands[6].first, CommandType::Font);
+    EXPECT_EQ(commands[7].first, CommandType::FontSize);
+    EXPECT_EQ(commands[8].first, CommandType::Text);
+}
+
+// Test: Parse with verbose and printer options
+TEST_F(CliParserTest, ParseCombinedOptions) {
+    std::vector<std::string> args = {
+        "ptprnt",
+        "-v",
+        "--trace",
+        "-p", "P700",
+        "-t", "Test"
+    };
+    auto argv = makeArgv(args);
+
+    int result = parser->parse(args.size(), argv.data());
+
+    EXPECT_EQ(result, 0);
+    EXPECT_TRUE(parser->getOptions().verbose);
+    EXPECT_TRUE(parser->getOptions().trace);
+    EXPECT_EQ(parser->getOptions().printerSelection, "P700");
+    EXPECT_FALSE(parser->getOptions().commands.empty());
+}
+
+// Test: Parse help flag (should return 1)
+TEST_F(CliParserTest, ParseHelp) {
+    std::vector<std::string> args = {"ptprnt", "-h"};
+    auto argv = makeArgv(args);
+
+    int result = parser->parse(args.size(), argv.data());
+
+    EXPECT_EQ(result, 1);  // Signal clean exit
+}
+
+TEST_F(CliParserTest, ParseHelpLong) {
+    std::vector<std::string> args = {"ptprnt", "--help"};
+    auto argv = makeArgv(args);
+
+    int result = parser->parse(args.size(), argv.data());
+
+    EXPECT_EQ(result, 1);  // Signal clean exit
+}
+
+// Test: Parse version flag (should return 1)
+TEST_F(CliParserTest, ParseVersion) {
+    std::vector<std::string> args = {"ptprnt", "-V"};
+    auto argv = makeArgv(args);
+
+    int result = parser->parse(args.size(), argv.data());
+
+    EXPECT_EQ(result, 1);  // Signal clean exit
+}
+
+TEST_F(CliParserTest, ParseVersionLong) {
+    std::vector<std::string> args = {"ptprnt", "--version"};
+    auto argv = makeArgv(args);
+
+    int result = parser->parse(args.size(), argv.data());
+
+    EXPECT_EQ(result, 1);  // Signal clean exit
+}
+
+// Test: Parse invalid option (should return -1)
+TEST_F(CliParserTest, ParseInvalidOption) {
+    std::vector<std::string> args = {"ptprnt", "--invalid-option"};
+    auto argv = makeArgv(args);
+
+    int result = parser->parse(args.size(), argv.data());
+
+    EXPECT_EQ(result, -1);  // Signal error
+}
+
+// Test: Default printer selection is "auto"
+TEST_F(CliParserTest, DefaultPrinterSelection) {
+    std::vector<std::string> args = {"ptprnt", "-t", "Test"};
+    auto argv = makeArgv(args);
+
+    parser->parse(args.size(), argv.data());
+
+    EXPECT_EQ(parser->getOptions().printerSelection, "auto");
+}
+
+// Test: Long text with spaces
+TEST_F(CliParserTest, ParseTextWithSpaces) {
+    std::vector<std::string> args = {"ptprnt", "-t", "Hello World"};
+    auto argv = makeArgv(args);
+
+    int result = parser->parse(args.size(), argv.data());
+
+    EXPECT_EQ(result, 0);
+    const auto& commands = parser->getOptions().commands;
+    ASSERT_EQ(commands.size(), 1);
+    EXPECT_EQ(commands[0].second, "Hello World");
+}
+
+}  // namespace ptprnt::cli

tests/fake_printer_test/fake_printer_test.cpp

@@ -0,0 +1,247 @@
+/*
+    ptrnt - print labels on linux
+    Copyright (C) 2025  Moritz Martinius
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+ */
+
+#include <gtest/gtest.h>
+
+#include "graphics/Bitmap.hpp"
+#include "graphics/Label.hpp"
+#include "graphics/Monochrome.hpp"
+#include "printers/FakePrinter.hpp"
+
+namespace ptprnt::printer {
+
+class FakePrinterTest : public ::testing::Test {
+   protected:
+    void SetUp() override {
+        printer = std::make_unique<FakePrinter>();
+    }
+
+    void TearDown() override { printer.reset(); }
+
+    std::unique_ptr<FakePrinter> printer;
+};
+
+// Test: Get driver name
+TEST_F(FakePrinterTest, GetDriverName) {
+    auto name = printer->getDriverName();
+    EXPECT_FALSE(name.empty());
+    EXPECT_EQ(name, "FakePrinter");
+}
+
+// Test: Get printer name
+TEST_F(FakePrinterTest, GetName) {
+    auto name = printer->getName();
+    EXPECT_FALSE(name.empty());
+}
+
+// Test: Get USB ID
+TEST_F(FakePrinterTest, GetUsbId) {
+    auto usbId = printer->getUsbId();
+    EXPECT_EQ(usbId.first, 0x0000);   // Virtual printer - no USB ID
+    EXPECT_EQ(usbId.second, 0x0000);  // Virtual printer - no USB ID
+}
+
+// Test: Get printer version
+TEST_F(FakePrinterTest, GetVersion) {
+    auto version = printer->getVersion();
+    EXPECT_FALSE(version.empty());
+}
+
+// Test: Get printer info
+TEST_F(FakePrinterTest, GetPrinterInfo) {
+    auto info = printer->getPrinterInfo();
+
+    EXPECT_FALSE(info.driverName.empty());
+    EXPECT_FALSE(info.name.empty());
+    EXPECT_GT(info.pixelLines, 0);
+}
+
+// Test: Get printer status without device
+TEST_F(FakePrinterTest, GetPrinterStatusWithoutDevice) {
+    auto status = printer->getPrinterStatus();
+
+    // FakePrinter should return empty status when no device attached
+    EXPECT_EQ(status.tapeWidthMm, 0);
+}
+
+// Test: Get printer status with device
+TEST_F(FakePrinterTest, GetPrinterStatusWithDevice) {
+    printer->attachUsbDevice(nullptr);
+    auto status = printer->getPrinterStatus();
+
+    // FakePrinter should return default status when device attached
+    EXPECT_EQ(status.tapeWidthMm, 12);  // Default tape width
+}
+
+// Test: Attach USB device (should always succeed for fake printer)
+TEST_F(FakePrinterTest, AttachUsbDevice) {
+    bool result = printer->attachUsbDevice(nullptr);
+
+    // FakePrinter doesn't need a real device
+    EXPECT_TRUE(result);
+}
+
+// Test: Detach USB device
+TEST_F(FakePrinterTest, DetachUsbDevice) {
+    printer->attachUsbDevice(nullptr);
+    bool result = printer->detachUsbDevice();
+
+    EXPECT_TRUE(result);
+}
+
+// Test: Print without attaching device first
+TEST_F(FakePrinterTest, PrintWithoutDevice) {
+    bool result = printer->print();
+
+    // FakePrinter should fail if no device attached
+    EXPECT_FALSE(result);
+}
+
+// Test: Print after attaching device
+TEST_F(FakePrinterTest, PrintWithDevice) {
+    printer->attachUsbDevice(nullptr);
+    bool result = printer->print();
+
+    EXPECT_TRUE(result);
+}
+
+// Test: Print bitmap
+TEST_F(FakePrinterTest, PrintBitmap) {
+    graphics::Bitmap<graphics::ALPHA8> bitmap(100, 128);
+
+    // Fill with some pattern
+    std::vector<graphics::ALPHA8> pixels(bitmap.getWidth() * bitmap.getHeight());
+    for (size_t i = 0; i < pixels.size(); ++i) {
+        pixels[i] = (i % 2) ? 0xFF : 0x00;
+    }
+    bitmap.setPixels(pixels);
+
+    printer->attachUsbDevice(nullptr);
+    bool result = printer->printBitmap(bitmap);
+
+    EXPECT_TRUE(result);
+
+    // Check that last print was saved
+    const auto& lastPrint = printer->getLastPrint();
+    EXPECT_GT(lastPrint.getWidth(), 0);
+    EXPECT_GT(lastPrint.getHeight(), 0);
+}
+
+// Test: Print monochrome data
+TEST_F(FakePrinterTest, PrintMonochromeData) {
+    graphics::Bitmap<graphics::ALPHA8> bitmap(50, 128);
+    auto pixels = bitmap.getPixelsCpy();
+    auto mono   = graphics::Monochrome(pixels, bitmap.getWidth(), bitmap.getHeight());
+    auto data   = mono.get();
+
+    printer->attachUsbDevice(nullptr);
+    bool result = printer->printMonochromeData(data);
+
+    EXPECT_TRUE(result);
+
+    // Verify last print
+    const auto& lastPrint = printer->getLastPrint();
+    EXPECT_GT(lastPrint.getWidth(), 0);
+}
+
+// Test: Print label
+TEST_F(FakePrinterTest, PrintLabel) {
+    auto label = std::make_unique<graphics::Label>(128);
+    label->create("Test Label");
+
+    printer->attachUsbDevice(nullptr);
+    bool result = printer->printLabel(std::move(label));
+
+    EXPECT_TRUE(result);
+}
+
+// Test: Print null label
+TEST_F(FakePrinterTest, PrintNullLabel) {
+    printer->attachUsbDevice(nullptr);
+    bool result = printer->printLabel(nullptr);
+
+    EXPECT_FALSE(result);
+}
+
+// Test: Print empty bitmap
+TEST_F(FakePrinterTest, PrintEmptyBitmap) {
+    graphics::Bitmap<graphics::ALPHA8> bitmap(0, 0);
+
+    printer->attachUsbDevice(nullptr);
+    bool result = printer->printBitmap(bitmap);
+
+    // Should handle empty bitmap gracefully
+    EXPECT_TRUE(result);
+}
+
+// Test: Get last print before printing
+TEST_F(FakePrinterTest, GetLastPrintBeforePrinting) {
+    // Should throw when getting last print before any print operation
+    EXPECT_THROW({
+        const auto& lastPrint = printer->getLastPrint();
+        (void)lastPrint;  // Suppress unused variable warning
+    }, std::runtime_error);
+}
+
+// Test: Save last print to PNG (may fail without valid data)
+TEST_F(FakePrinterTest, SaveLastPrintToPng) {
+    graphics::Bitmap<graphics::ALPHA8> bitmap(100, 128);
+
+    printer->attachUsbDevice(nullptr);
+    printer->printBitmap(bitmap);
+
+    // Try to save to /tmp
+    bool result = printer->saveLastPrintToPng("/tmp/test_fake_printer_output.png");
+
+    // Should succeed if we have valid print data
+    EXPECT_TRUE(result);
+}
+
+// Test: Multiple prints
+TEST_F(FakePrinterTest, MultiplePrints) {
+    graphics::Bitmap<graphics::ALPHA8> bitmap1(50, 128);
+    graphics::Bitmap<graphics::ALPHA8> bitmap2(100, 128);
+
+    printer->attachUsbDevice(nullptr);
+
+    bool result1 = printer->printBitmap(bitmap1);
+    EXPECT_TRUE(result1);
+
+    bool result2 = printer->printBitmap(bitmap2);
+    EXPECT_TRUE(result2);
+
+    // Last print should be from second bitmap
+    const auto& lastPrint = printer->getLastPrint();
+    EXPECT_GT(lastPrint.getWidth(), 0);
+}
+
+// Test: Detach and reattach
+TEST_F(FakePrinterTest, DetachAndReattach) {
+    printer->attachUsbDevice(nullptr);
+    EXPECT_TRUE(printer->detachUsbDevice());
+
+    // Should be able to reattach
+    EXPECT_TRUE(printer->attachUsbDevice(nullptr));
+
+    // Should be able to print after reattach
+    graphics::Bitmap<graphics::ALPHA8> bitmap(50, 128);
+    EXPECT_TRUE(printer->printBitmap(bitmap));
+}
+
+}  // namespace ptprnt::printer

tests/label_builder_test/label_builder_test.cpp

@@ -0,0 +1,230 @@
+/*
+    ptrnt - print labels on linux
+    Copyright (C) 2025  Moritz Martinius
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+ */
+
+#include <gtest/gtest.h>
+
+#include "graphics/LabelBuilder.hpp"
+#include "graphics/interface/ILabel.hpp"
+
+namespace ptprnt::graphics {
+
+class LabelBuilderTest : public ::testing::Test {
+   protected:
+    void SetUp() override {
+        builder = std::make_unique<LabelBuilder>(128);  // P700 printer height
+    }
+
+    void TearDown() override { builder.reset(); }
+
+    std::unique_ptr<LabelBuilder> builder;
+};
+
+// Test: Constructor
+TEST_F(LabelBuilderTest, Constructor) {
+    EXPECT_NO_THROW(LabelBuilder(128));
+    EXPECT_NO_THROW(LabelBuilder(64));
+}
+
+// Test: Add single text
+TEST_F(LabelBuilderTest, AddSingleText) {
+    auto& result = builder->addText("Hello");
+
+    // Should return reference to builder for chaining
+    EXPECT_EQ(&result, builder.get());
+}
+
+// Test: Add multiple texts
+TEST_F(LabelBuilderTest, AddMultipleTexts) {
+    builder->addText("Line 1")
+           .addText("Line 2")
+           .addText("Line 3");
+
+    // Build should succeed
+    auto label = builder->build();
+    EXPECT_NE(label, nullptr);
+}
+
+// Test: Add empty text (should be ignored)
+TEST_F(LabelBuilderTest, AddEmptyText) {
+    builder->addText("");
+
+    auto label = builder->build();
+    EXPECT_NE(label, nullptr);
+}
+
+// Test: Set font family
+TEST_F(LabelBuilderTest, SetFontFamily) {
+    auto& result = builder->setFontFamily("monospace");
+
+    // Should return reference to builder for chaining
+    EXPECT_EQ(&result, builder.get());
+}
+
+// Test: Set font size
+TEST_F(LabelBuilderTest, SetFontSize) {
+    auto& result = builder->setFontSize(24.0);
+
+    // Should return reference to builder for chaining
+    EXPECT_EQ(&result, builder.get());
+}
+
+// Test: Set horizontal alignment
+TEST_F(LabelBuilderTest, SetHAlign) {
+    auto& result = builder->setHAlign(HAlignPosition::CENTER);
+
+    // Should return reference to builder for chaining
+    EXPECT_EQ(&result, builder.get());
+}
+
+// Test: Set vertical alignment
+TEST_F(LabelBuilderTest, SetVAlign) {
+    auto& result = builder->setVAlign(VAlignPosition::TOP);
+
+    // Should return reference to builder for chaining
+    EXPECT_EQ(&result, builder.get());
+}
+
+// Test: Build with default settings
+TEST_F(LabelBuilderTest, BuildWithDefaults) {
+    builder->addText("Test");
+
+    auto label = builder->build();
+
+    EXPECT_NE(label, nullptr);
+    EXPECT_GT(label->getWidth(), 0);
+    EXPECT_GT(label->getHeight(), 0);
+}
+
+// Test: Build with custom settings
+TEST_F(LabelBuilderTest, BuildWithCustomSettings) {
+    builder->setFontFamily("serif")
+           .setFontSize(48.0)
+           .setHAlign(HAlignPosition::CENTER)
+           .setVAlign(VAlignPosition::MIDDLE)
+           .addText("Custom Text");
+
+    auto label = builder->build();
+
+    EXPECT_NE(label, nullptr);
+}
+
+// Test: Method chaining
+TEST_F(LabelBuilderTest, MethodChaining) {
+    auto label = builder->setFontFamily("monospace")
+                         .setFontSize(20.0)
+                         .setHAlign(HAlignPosition::RIGHT)
+                         .setVAlign(VAlignPosition::BOTTOM)
+                         .addText("Chained")
+                         .addText("Methods")
+                         .build();
+
+    EXPECT_NE(label, nullptr);
+}
+
+// Test: Reset builder
+TEST_F(LabelBuilderTest, Reset) {
+    builder->setFontFamily("monospace")
+           .setFontSize(48.0)
+           .setHAlign(HAlignPosition::RIGHT)
+           .setVAlign(VAlignPosition::BOTTOM)
+           .addText("Test");
+
+    auto& result = builder->reset();
+
+    // Should return reference to builder for chaining
+    EXPECT_EQ(&result, builder.get());
+
+    // After reset, should be able to build with defaults
+    builder->addText("After Reset");
+    auto label = builder->build();
+    EXPECT_NE(label, nullptr);
+}
+
+// Test: Build empty label
+TEST_F(LabelBuilderTest, BuildEmptyLabel) {
+    // Build without adding any text
+    auto label = builder->build();
+
+    EXPECT_NE(label, nullptr);
+}
+
+// Test: Multiple builds from same builder
+TEST_F(LabelBuilderTest, MultipleBuilds) {
+    builder->addText("First Build");
+    auto label1 = builder->build();
+    EXPECT_NE(label1, nullptr);
+
+    // Build again with same content
+    auto label2 = builder->build();
+    EXPECT_NE(label2, nullptr);
+
+    // Both labels should be valid
+    EXPECT_GT(label1->getWidth(), 0);
+    EXPECT_GT(label2->getWidth(), 0);
+}
+
+// Test: All horizontal alignments
+TEST_F(LabelBuilderTest, AllHorizontalAlignments) {
+    builder->addText("Left").setHAlign(HAlignPosition::LEFT);
+    auto label1 = builder->build();
+    EXPECT_NE(label1, nullptr);
+
+    builder->reset().addText("Center").setHAlign(HAlignPosition::CENTER);
+    auto label2 = builder->build();
+    EXPECT_NE(label2, nullptr);
+
+    builder->reset().addText("Right").setHAlign(HAlignPosition::RIGHT);
+    auto label3 = builder->build();
+    EXPECT_NE(label3, nullptr);
+
+    builder->reset().addText("Justify").setHAlign(HAlignPosition::JUSTIFY);
+    auto label4 = builder->build();
+    EXPECT_NE(label4, nullptr);
+}
+
+// Test: All vertical alignments
+TEST_F(LabelBuilderTest, AllVerticalAlignments) {
+    builder->addText("Top").setVAlign(VAlignPosition::TOP);
+    auto label1 = builder->build();
+    EXPECT_NE(label1, nullptr);
+
+    builder->reset().addText("Middle").setVAlign(VAlignPosition::MIDDLE);
+    auto label2 = builder->build();
+    EXPECT_NE(label2, nullptr);
+
+    builder->reset().addText("Bottom").setVAlign(VAlignPosition::BOTTOM);
+    auto label3 = builder->build();
+    EXPECT_NE(label3, nullptr);
+}
+
+// Test: Different font sizes
+TEST_F(LabelBuilderTest, DifferentFontSizes) {
+    builder->setFontSize(12.0).addText("Small");
+    auto label1 = builder->build();
+    EXPECT_NE(label1, nullptr);
+
+    builder->reset().setFontSize(64.0).addText("Large");
+    auto label2 = builder->build();
+    EXPECT_NE(label2, nullptr);
+
+    // Larger font should produce wider label (assuming same text length)
+    // Note: This is a heuristic test and may not always be true depending on font rendering
+}
+
+}  // namespace ptprnt::graphics

tests/label_test/label_test.cpp

@@ -25,8 +25,8 @@
 #include <memory>
 #include <vector>
 
-#include "../../tests/mocks/MockCairoWrapper.hpp"
 #include "graphics/interface/ILabel.hpp"
+#include "mocks/MockCairoWrapper.hpp"
 
 using ::testing::_;
 using ::testing::DoAll;

tests/meson.build

@@ -1,51 +1,56 @@
-tests = [
+# Consolidated test binary - all tests in one executable for faster linking
-    [
+
-        'bitmap_test',
+test_sources = [
-        'bitmap_test_exe',
+    # Test files
-        ['../src/graphics/Bitmap.cpp', 'bitmap_test/bitmap_test.cpp'],
+    'bitmap_test/bitmap_test.cpp',
-    ],
+    'monochrome_test/monochrome_test.cpp',
-    [
+    'label_test/label_test.cpp',
-        'monochrome_test',
+    'label_builder_test/label_builder_test.cpp',
-        'monochrome_test_exe',
+    'printer_service_test/printer_service_test.cpp',
-        [
+    'p700_printer_test/p700_printer_test.cpp',
-            '../src/graphics/Monochrome.cpp',
+    'fake_printer_test/fake_printer_test.cpp',
-            'monochrome_test/monochrome_test.cpp',
+    'cli_parser_test/cli_parser_test.cpp',
-        ],
+    'ptouch_print_test/ptouch_print_test.cpp',
-    ],
+    'usb_device_test/usb_device_test.cpp',
+
+    # Source files under test - graphics
+    '../src/graphics/Bitmap.cpp',
+    '../src/graphics/Monochrome.cpp',
+    '../src/graphics/Label.cpp',
+    '../src/graphics/LabelBuilder.cpp',
+
+    # Source files under test - core
+    '../src/core/PrinterService.cpp',
+    '../src/core/PrinterDriverFactory.cpp',
+
+    # Source files under test - printers
+    '../src/printers/P700Printer.cpp',
+    '../src/printers/FakePrinter.cpp',
+
+    # Source files under test - CLI
+    '../src/cli/CliParser.cpp',
+
+    # Source files under test - Main app
+    '../src/PtouchPrint.cpp',
+
+    # Source files under test - USB
+    '../src/libusbwrap/LibUsbWrapper.cpp',
+    '../src/libusbwrap/UsbDevice.cpp',
+    '../src/libusbwrap/UsbDeviceFactory.cpp',
 ]
 
-foreach test : tests
+test_exe = executable(
-    test(
+    'ptprnt_tests',
-        test.get(0),
+    sources: test_sources,
-        executable(
+    include_directories: incdir,
-            test.get(1),
+    dependencies: [
-            sources: test.get(2),
+        gmock_dep, # GMock includes GTest
-            include_directories: incdir,
+        usb_dep,
-            dependencies: [
+        log_dep,
-                gtest_dep,
+        pangocairo_dep,
-                usb_dep,
+        cli11_dep,
-                log_dep,
+    ],
-                pangocairo_dep,
+)
-                cli11_dep,
-            ],
-        ),
-    )
-endforeach
 
-# Label test requires GMock for mocking Cairo/Pango
+# Single test that runs all test suites
-test(
+test('all_tests', test_exe)
-    'label_test',
-    executable(
-        'label_test_exe',
-        sources: ['../src/graphics/Label.cpp', 'label_test/label_test.cpp'],
-        include_directories: incdir,
-        dependencies: [
-            gmock_dep,
-            gtest_dep,
-            usb_dep,
-            log_dep,
-            pangocairo_dep,
-            cli11_dep,
-        ],
-    ),
-)

tests/mocks/MockLibUsbWrapper.hpp

@@ -0,0 +1,76 @@
+/*
+    ptrnt - print labels on linux
+    Copyright (C) 2025  Moritz Martinius
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+ */
+
+#pragma once
+
+#include <gmock/gmock.h>
+
+#include "libusbwrap/LibUsbWrapper.hpp"
+
+namespace libusbwrap {
+
+/**
+ * @brief GMock implementation of ILibUsbWrapper for unit testing
+ *
+ * This mock allows tests to verify that UsbDevice and UsbDeviceFactory
+ * correctly interact with the libusb API without requiring actual USB hardware.
+ */
+class MockLibUsbWrapper : public ILibUsbWrapper {
+   public:
+    // Context management
+    MOCK_METHOD(int, init, (libusb_context * *ctx), (override));
+    MOCK_METHOD(void, exit, (libusb_context * ctx), (override));
+
+    // Device enumeration
+    MOCK_METHOD(ssize_t, getDeviceList, (libusb_context * ctx, libusb_device*** list), (override));
+    MOCK_METHOD(void, freeDeviceList, (libusb_device * *list, int unrefDevices), (override));
+    MOCK_METHOD(void, refDevice, (libusb_device * dev), (override));
+    MOCK_METHOD(void, unrefDevice, (libusb_device * dev), (override));
+
+    // Device descriptor
+    MOCK_METHOD(int, getDeviceDescriptor, (libusb_device * dev, libusb_device_descriptor* desc), (override));
+
+    // Device opening/closing
+    MOCK_METHOD(int, open, (libusb_device * dev, libusb_device_handle** handle), (override));
+    MOCK_METHOD(void, close, (libusb_device_handle * handle), (override));
+
+    // Device information
+    MOCK_METHOD(int, getSpeed, (libusb_device * dev), (override));
+    MOCK_METHOD(uint8_t, getBusNumber, (libusb_device * dev), (override));
+    MOCK_METHOD(uint8_t, getPortNumber, (libusb_device * dev), (override));
+
+    // Kernel driver management
+    MOCK_METHOD(int, kernelDriverActive, (libusb_device_handle * handle, int interfaceNo), (override));
+    MOCK_METHOD(int, detachKernelDriver, (libusb_device_handle * handle, int interfaceNo), (override));
+
+    // Interface management
+    MOCK_METHOD(int, claimInterface, (libusb_device_handle * handle, int interfaceNo), (override));
+    MOCK_METHOD(int, releaseInterface, (libusb_device_handle * handle, int interfaceNo), (override));
+
+    // Data transfer
+    MOCK_METHOD(int, bulkTransfer,
+                (libusb_device_handle * handle, uint8_t endpoint, unsigned char* data, int length, int* transferred,
+                 unsigned int timeout),
+                (override));
+
+    // Error handling
+    MOCK_METHOD(const char*, errorName, (int errorCode), (override));
+};
+
+}  // namespace libusbwrap

tests/mocks/MockPrinterDriver.hpp

@@ -0,0 +1,50 @@
+/*
+    ptrnt - print labels on linux
+    Copyright (C) 2025  Moritz Martinius
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+ */
+
+#pragma once
+
+#include <gmock/gmock.h>
+
+#include "printers/interface/IPrinterDriver.hpp"
+
+namespace ptprnt {
+
+/**
+ * @brief GMock implementation of IPrinterDriver for unit testing
+ *
+ * This mock allows tests to verify printer interactions without
+ * requiring actual printer hardware.
+ */
+class MockPrinterDriver : public IPrinterDriver {
+   public:
+    MOCK_METHOD(std::string_view, getDriverName, (), (override));
+    MOCK_METHOD(std::string_view, getName, (), (override));
+    MOCK_METHOD(std::string_view, getVersion, (), (override));
+    MOCK_METHOD(libusbwrap::usbId, getUsbId, (), (override));
+    MOCK_METHOD(PrinterInfo, getPrinterInfo, (), (override));
+    MOCK_METHOD(PrinterStatus, getPrinterStatus, (), (override));
+    MOCK_METHOD(bool, attachUsbDevice, (std::shared_ptr<libusbwrap::IUsbDevice> usbHndl), (override));
+    MOCK_METHOD(bool, detachUsbDevice, (), (override));
+    MOCK_METHOD(bool, printBitmap, (const graphics::Bitmap<graphics::ALPHA8>& bitmap), (override));
+    MOCK_METHOD(bool, printMonochromeData, (const graphics::MonochromeData& data), (override));
+    MOCK_METHOD(bool, printLabel, (const std::unique_ptr<graphics::ILabel> label), (override));
+    MOCK_METHOD(bool, print, (), (override));
+};
+
+}  // namespace ptprnt

tests/mocks/MockUsbDevice.hpp

@@ -0,0 +1,57 @@
+/*
+    ptrnt - print labels on linux
+    Copyright (C) 2025  Moritz Martinius
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+ */
+
+#pragma once
+
+#include <gmock/gmock.h>
+
+#include "libusbwrap/interface/IUsbDevice.hpp"
+
+namespace libusbwrap {
+
+/**
+ * @brief GMock implementation of IUsbDevice for unit testing
+ *
+ * This mock allows tests to verify USB device interactions without
+ * requiring actual hardware or libusb context.
+ */
+class MockUsbDevice : public IUsbDevice {
+   public:
+    MOCK_METHOD(bool, open, (), (override));
+    MOCK_METHOD(void, close, (), (override));
+
+    // libusb wrappers
+    MOCK_METHOD(bool, detachKernelDriver, (int interfaceNo), (override));
+    MOCK_METHOD(bool, claimInterface, (int interfaceNo), (override));
+    MOCK_METHOD(bool, releaseInterface, (int interfaceNo), (override));
+    MOCK_METHOD(bool, bulkTransfer,
+                (uint8_t endpoint, const std::vector<uint8_t>& data, int* tx, unsigned int timeout), (override));
+
+    // getters
+    MOCK_METHOD(const usbId, getUsbId, (), (override));
+    MOCK_METHOD(const device::Speed, getSpeed, (), (override));
+    MOCK_METHOD(const uint8_t, getBusNumber, (), (override));
+    MOCK_METHOD(const uint8_t, getPortNumber, (), (override));
+
+    // errors
+    MOCK_METHOD(const Error, getLastError, (), (override));
+    MOCK_METHOD(const std::string, getLastErrorString, (), (override));
+};
+
+}  // namespace libusbwrap

tests/mocks/MockUsbDeviceFactory.hpp

@@ -0,0 +1,41 @@
+/*
+    ptrnt - print labels on linux
+    Copyright (C) 2025  Moritz Martinius
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+ */
+
+#pragma once
+
+#include <gmock/gmock.h>
+
+#include "libusbwrap/interface/IUsbDeviceFactory.hpp"
+
+namespace libusbwrap {
+
+/**
+ * @brief GMock implementation of IUsbDeviceFactory for unit testing
+ *
+ * This mock allows tests to control USB device discovery without
+ * requiring actual libusb context or hardware.
+ */
+class MockUsbDeviceFactory : public IUsbDeviceFactory {
+   public:
+    MOCK_METHOD(bool, init, (), (override));
+    MOCK_METHOD(std::vector<std::unique_ptr<IUsbDevice>>, findAllDevices, (), (override));
+    MOCK_METHOD(std::vector<std::unique_ptr<IUsbDevice>>, findDevices, (uint16_t vid, uint16_t pid), (override));
+};
+
+}  // namespace libusbwrap

tests/monochrome_test/monochrome_test.cpp

@@ -57,9 +57,6 @@ TEST(basic_test, Monochrome_convertWithCustomThreshhold_yieldsMonochromeRespecti
 }
 
 TEST(basic_test, Monochrome_convertNonAlignedPixels_spillsOverIntoNewByte) {
-    // TODO: We need to find to access the vector without the possiblity of out-of-bounds access
-    // Ideas: constexpr? compile time check?
-    GTEST_SKIP() << "Skipping this test, as ASAN will halt as this is an out-of-bounds access";
     const std::vector<uint8_t> pixels(
         {0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF});
 

tests/p700_printer_test/p700_printer_test.cpp

@@ -0,0 +1,169 @@
+/*
+    ptrnt - print labels on linux
+    Copyright (C) 2025  Moritz Martinius
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+ */
+
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+
+#include <memory>
+
+#include "graphics/Bitmap.hpp"
+#include "graphics/Monochrome.hpp"
+#include "mocks/MockUsbDevice.hpp"
+#include "printers/P700Printer.hpp"
+
+using ::testing::_;
+using ::testing::DoAll;
+using ::testing::NiceMock;
+using ::testing::Return;
+using ::testing::SetArgPointee;
+
+namespace ptprnt::printer {
+
+// Test fixture for P700Printer tests
+class P700PrinterTest : public ::testing::Test {
+   protected:
+    void SetUp() override {
+        printer    = std::make_unique<P700Printer>();
+        mockUsbDev = std::make_shared<NiceMock<libusbwrap::MockUsbDevice>>();
+
+        // Default mock behaviors
+        ON_CALL(*mockUsbDev, open()).WillByDefault(Return(true));
+        ON_CALL(*mockUsbDev, close()).WillByDefault(Return());
+        ON_CALL(*mockUsbDev, detachKernelDriver(_)).WillByDefault(Return(true));
+        ON_CALL(*mockUsbDev, claimInterface(_)).WillByDefault(Return(true));
+        ON_CALL(*mockUsbDev, releaseInterface(_)).WillByDefault(Return(true));
+        ON_CALL(*mockUsbDev, bulkTransfer(_, _, _, _)).WillByDefault(Return(true));
+        ON_CALL(*mockUsbDev, getUsbId()).WillByDefault(Return(libusbwrap::usbId{0x04f9, 0x2061}));
+    }
+
+    void TearDown() override { printer.reset(); }
+
+    std::unique_ptr<P700Printer> printer;
+    std::shared_ptr<libusbwrap::MockUsbDevice> mockUsbDev;
+};
+
+// Test: Get printer driver name
+TEST_F(P700PrinterTest, GetDriverName) {
+    EXPECT_EQ(printer->getDriverName(), "P700");
+}
+
+// Test: Get printer name
+TEST_F(P700PrinterTest, GetName) {
+    auto name = printer->getName();
+    EXPECT_FALSE(name.empty());
+}
+
+// Test: Get USB ID
+TEST_F(P700PrinterTest, GetUsbId) {
+    auto usbId = printer->getUsbId();
+    EXPECT_EQ(usbId.first, 0x04f9);   // Brother VID
+    EXPECT_EQ(usbId.second, 0x2061);  // P700 PID
+}
+
+// Test: Get printer version
+TEST_F(P700PrinterTest, GetVersion) {
+    auto version = printer->getVersion();
+    EXPECT_FALSE(version.empty());
+}
+
+// Test: Get printer info
+TEST_F(P700PrinterTest, GetPrinterInfo) {
+    auto info = printer->getPrinterInfo();
+    EXPECT_EQ(info.pixelLines, 128);
+    EXPECT_FALSE(info.name.empty());
+}
+
+// Test: Attach USB device
+TEST_F(P700PrinterTest, AttachUsbDevice) {
+    bool result = printer->attachUsbDevice(mockUsbDev);
+
+    EXPECT_TRUE(result);
+}
+
+// Test: Attach USB device with null pointer
+TEST_F(P700PrinterTest, AttachNullUsbDevice) {
+    bool result = printer->attachUsbDevice(nullptr);
+
+    EXPECT_FALSE(result);
+}
+
+// Test: Detach USB device
+TEST_F(P700PrinterTest, DetachUsbDevice) {
+    printer->attachUsbDevice(mockUsbDev);
+
+    bool result = printer->detachUsbDevice();
+
+    EXPECT_TRUE(result);
+}
+
+// Test: Detach when no device attached
+TEST_F(P700PrinterTest, DetachNoDevice) {
+    bool result = printer->detachUsbDevice();
+
+    // Production code returns true when no device is attached (just logs warning)
+    EXPECT_TRUE(result);
+}
+
+// Test: Get printer status without device
+TEST_F(P700PrinterTest, GetStatusNoDevice) {
+    auto status = printer->getPrinterStatus();
+
+    EXPECT_EQ(status.tapeWidthPixel, 0);  // Should be 0 when no device
+}
+
+// Test: Print without attached device
+TEST_F(P700PrinterTest, PrintWithoutDevice) {
+    bool result = printer->print();
+
+    // Should fail when no device is attached
+    EXPECT_FALSE(result);
+}
+
+// Test: Print bitmap without device
+TEST_F(P700PrinterTest, PrintBitmapWithoutDevice) {
+    graphics::Bitmap<graphics::ALPHA8> bitmap(10, 10);
+
+    bool result = printer->printBitmap(bitmap);
+
+    EXPECT_FALSE(result);
+}
+
+// Test: Print monochrome data without device
+TEST_F(P700PrinterTest, PrintMonochromeDataWithoutDevice) {
+    graphics::MonochromeData data;
+    data.width  = 10;
+    data.height = 10;
+    data.bytes  = std::vector<uint8_t>(20, 0xFF);
+    data.stride = 2;
+
+    bool result = printer->printMonochromeData(data);
+
+    EXPECT_FALSE(result);
+}
+
+// Test: Print label with null pointer
+TEST_F(P700PrinterTest, PrintNullLabel) {
+    std::unique_ptr<graphics::ILabel> label = nullptr;
+
+    bool result = printer->printLabel(std::move(label));
+
+    EXPECT_FALSE(result);
+}
+
+}  // namespace ptprnt::printer

tests/printer_service_test/printer_service_test.cpp

@@ -0,0 +1,128 @@
+/*
+    ptrnt - print labels on linux
+    Copyright (C) 2025  Moritz Martinius
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+ */
+
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+
+#include <memory>
+#include <vector>
+
+#include "core/PrinterDriverFactory.hpp"
+#include "core/PrinterService.hpp"
+#include "mocks/MockUsbDeviceFactory.hpp"
+
+using ::testing::_;
+using ::testing::Invoke;
+using ::testing::NiceMock;
+using ::testing::Return;
+
+namespace ptprnt::core {
+
+// Helper function to return empty vector of unique_ptrs
+std::vector<std::unique_ptr<libusbwrap::IUsbDevice>> returnEmptyDeviceList() {
+    return {};
+}
+
+// Test fixture for PrinterService tests
+class PrinterServiceTest : public ::testing::Test {
+   protected:
+    void SetUp() override {
+        // Create mock USB device factory
+        auto mockFactory = std::make_unique<NiceMock<libusbwrap::MockUsbDeviceFactory>>();
+        mockFactoryPtr   = mockFactory.get();
+
+        // Default behavior: init succeeds
+        ON_CALL(*mockFactoryPtr, init()).WillByDefault(Return(true));
+
+        // Default behavior: no devices found
+        ON_CALL(*mockFactoryPtr, findAllDevices()).WillByDefault(Invoke(returnEmptyDeviceList));
+
+        // Inject mock factory into service
+        service = std::make_unique<PrinterService>(std::move(mockFactory));
+    }
+
+    void TearDown() override { service.reset(); }
+
+    std::unique_ptr<PrinterService> service;
+    libusbwrap::MockUsbDeviceFactory* mockFactoryPtr;  // Non-owning pointer for expectations
+};
+
+// Test: PrinterService initialization
+TEST_F(PrinterServiceTest, InitializeSuccess) {
+    EXPECT_CALL(*mockFactoryPtr, init()).WillOnce(Return(true));
+
+    EXPECT_TRUE(service->initialize());
+}
+
+// Test: Detect printers when none are connected
+TEST_F(PrinterServiceTest, DetectPrintersNoneFound) {
+    service->initialize();
+
+    // Mock returns empty device list - no real USB enumeration happens
+    EXPECT_CALL(*mockFactoryPtr, findAllDevices()).WillOnce(Invoke(returnEmptyDeviceList));
+
+    auto printers = service->detectPrinters();
+
+    // Should get empty list since mock returns no devices
+    EXPECT_EQ(printers.size(), 0);
+}
+
+// Test: Select printer with auto-detect when none found
+TEST_F(PrinterServiceTest, SelectPrinterAutoNoneFound) {
+    service->initialize();
+
+    // Mock returns empty device list
+    EXPECT_CALL(*mockFactoryPtr, findAllDevices()).WillOnce(Invoke(returnEmptyDeviceList));
+
+    auto printer = service->selectPrinter("auto");
+
+    // Should be nullptr since no printers detected
+    EXPECT_EQ(printer, nullptr);
+    EXPECT_EQ(service->getCurrentPrinter(), nullptr);
+}
+
+// Test: Select non-existent printer by name
+TEST_F(PrinterServiceTest, SelectPrinterByNameNotFound) {
+    service->initialize();
+
+    // This test doesn't need USB mocking since selectPrinter("name")
+    // uses PrinterDriverFactory directly, not USB enumeration
+    auto printer = service->selectPrinter("NonExistentPrinter");
+
+    EXPECT_EQ(printer, nullptr);
+    EXPECT_EQ(service->getCurrentPrinter(), nullptr);
+}
+
+// Test: Get current printer when none selected
+TEST_F(PrinterServiceTest, GetCurrentPrinterNoneSelected) {
+    EXPECT_EQ(service->getCurrentPrinter(), nullptr);
+}
+
+// Test: Print label without selecting printer
+TEST_F(PrinterServiceTest, PrintLabelNoPrinterSelected) {
+    // Create a simple label (we need a valid ILabel pointer)
+    std::unique_ptr<graphics::ILabel> label = nullptr;  // nullptr label for this test
+
+    bool result = service->printLabel(std::move(label));
+
+    // Should fail because no printer is selected
+    EXPECT_FALSE(result);
+}
+
+}  // namespace ptprnt::core

tests/ptouch_print_test/ptouch_print_test.cpp

@@ -0,0 +1,374 @@
+/*
+    ptrnt - print labels on linux
+    Copyright (C) 2025  Moritz Martinius
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+ */
+
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+
+#include "PtouchPrint.hpp"
+#include "cli/interface/ICliParser.hpp"
+#include "core/interface/IPrinterService.hpp"
+#include "printers/interface/IPrinterDriver.hpp"
+
+using ::testing::_;
+using ::testing::NiceMock;
+using ::testing::Return;
+using ::testing::ReturnRef;
+
+namespace ptprnt {
+
+// Mock CLI Parser
+class MockCliParser : public cli::ICliParser {
+   public:
+    MOCK_METHOD(int, parse, (int argc, char** argv), (override));
+    MOCK_METHOD(const cli::CliOptions&, getOptions, (), (const, override));
+
+    cli::CliOptions options;
+};
+
+// Mock Printer Service
+class MockPrinterService : public core::IPrinterService {
+   public:
+    MOCK_METHOD(bool, initialize, (), (override));
+    MOCK_METHOD(std::vector<std::shared_ptr<IPrinterDriver>>, detectPrinters, (), (override));
+    MOCK_METHOD(std::shared_ptr<IPrinterDriver>, selectPrinter, (const std::string& selection), (override));
+    MOCK_METHOD(std::shared_ptr<IPrinterDriver>, getCurrentPrinter, (), (const, override));
+    MOCK_METHOD(bool, printLabel, (std::unique_ptr<graphics::ILabel> label), (override));
+};
+
+// Mock Printer Driver
+class MockPrinterDriver : public IPrinterDriver {
+   public:
+    MOCK_METHOD(std::string_view, getDriverName, (), (override));
+    MOCK_METHOD(std::string_view, getName, (), (override));
+    MOCK_METHOD(libusbwrap::usbId, getUsbId, (), (override));
+    MOCK_METHOD(std::string_view, getVersion, (), (override));
+    MOCK_METHOD(PrinterInfo, getPrinterInfo, (), (override));
+    MOCK_METHOD(PrinterStatus, getPrinterStatus, (), (override));
+    MOCK_METHOD(bool, attachUsbDevice, (std::shared_ptr<libusbwrap::IUsbDevice> usbHndl), (override));
+    MOCK_METHOD(bool, detachUsbDevice, (), (override));
+    MOCK_METHOD(bool, printBitmap, (const graphics::Bitmap<graphics::ALPHA8>& bitmap), (override));
+    MOCK_METHOD(bool, printMonochromeData, (const graphics::MonochromeData& data), (override));
+    MOCK_METHOD(bool, printLabel, (std::unique_ptr<graphics::ILabel> label), (override));
+    MOCK_METHOD(bool, print, (), (override));
+};
+
+class PtouchPrintTest : public ::testing::Test {
+   protected:
+    void SetUp() override {
+        mockCliParser = std::make_unique<NiceMock<MockCliParser>>();
+        mockPrinterService = std::make_unique<NiceMock<MockPrinterService>>();
+
+        // Store raw pointers for setting expectations
+        cliParserPtr = mockCliParser.get();
+        printerServicePtr = mockPrinterService.get();
+
+        // Default behavior: parse succeeds and returns empty options
+        ON_CALL(*cliParserPtr, parse(_, _)).WillByDefault(Return(0));
+        ON_CALL(*cliParserPtr, getOptions()).WillByDefault(ReturnRef(cliParserPtr->options));
+        ON_CALL(*printerServicePtr, initialize()).WillByDefault(Return(true));
+        ON_CALL(*printerServicePtr, printLabel(_)).WillByDefault(Return(true));
+    }
+
+    void TearDown() override {}
+
+    std::unique_ptr<MockCliParser> mockCliParser;
+    std::unique_ptr<MockPrinterService> mockPrinterService;
+    MockCliParser* cliParserPtr;
+    MockPrinterService* printerServicePtr;
+};
+
+// Test: Constructor with default implementations
+TEST_F(PtouchPrintTest, ConstructorDefault) {
+    EXPECT_NO_THROW(PtouchPrint app("v1.0.0"));
+}
+
+// Test: Constructor with custom implementations
+TEST_F(PtouchPrintTest, ConstructorCustom) {
+    EXPECT_NO_THROW({
+        PtouchPrint app("v1.0.0", std::move(mockCliParser), std::move(mockPrinterService));
+    });
+}
+
+// Test: init with successful parse
+TEST_F(PtouchPrintTest, InitSuccess) {
+    PtouchPrint app("v1.0.0", std::move(mockCliParser), std::move(mockPrinterService));
+
+    char* argv[] = {(char*)"ptprnt"};
+    int result = app.init(1, argv);
+
+    EXPECT_EQ(result, 0);
+}
+
+// Test: init with parse returning help (should return 1)
+TEST_F(PtouchPrintTest, InitHelp) {
+    ON_CALL(*cliParserPtr, parse(_, _)).WillByDefault(Return(1));
+
+    PtouchPrint app("v1.0.0", std::move(mockCliParser), std::move(mockPrinterService));
+
+    char* argv[] = {(char*)"ptprnt", (char*)"-h"};
+    int result = app.init(2, argv);
+
+    EXPECT_EQ(result, 1);  // Clean exit
+}
+
+// Test: init with parse error (should return -1)
+TEST_F(PtouchPrintTest, InitParseError) {
+    ON_CALL(*cliParserPtr, parse(_, _)).WillByDefault(Return(-1));
+
+    PtouchPrint app("v1.0.0", std::move(mockCliParser), std::move(mockPrinterService));
+
+    char* argv[] = {(char*)"ptprnt", (char*)"--invalid"};
+    int result = app.init(2, argv);
+
+    EXPECT_EQ(result, -1);  // Error
+}
+
+// Test: init with printer service initialization failure
+TEST_F(PtouchPrintTest, InitPrinterServiceFailure) {
+    ON_CALL(*printerServicePtr, initialize()).WillByDefault(Return(false));
+
+    PtouchPrint app("v1.0.0", std::move(mockCliParser), std::move(mockPrinterService));
+
+    char* argv[] = {(char*)"ptprnt"};
+    int result = app.init(1, argv);
+
+    EXPECT_EQ(result, -1);  // Error
+}
+
+// Test: run with list drivers option
+TEST_F(PtouchPrintTest, RunListDrivers) {
+    cliParserPtr->options.listDrivers = true;
+
+    PtouchPrint app("v1.0.0", std::move(mockCliParser), std::move(mockPrinterService));
+
+    char* argv[] = {(char*)"ptprnt"};
+    app.init(1, argv);
+
+    int result = app.run();
+
+    EXPECT_EQ(result, 0);
+}
+
+// Test: run with no commands (should warn but succeed)
+TEST_F(PtouchPrintTest, RunNoCommands) {
+    auto mockPrinter = std::make_shared<NiceMock<MockPrinterDriver>>();
+    PrinterStatus status{.tapeWidthMm = 12};
+
+    ON_CALL(*mockPrinter, getPrinterStatus()).WillByDefault(Return(status));
+    ON_CALL(*printerServicePtr, selectPrinter(_)).WillByDefault(Return(mockPrinter));
+
+    cliParserPtr->options.commands.clear();
+
+    PtouchPrint app("v1.0.0", std::move(mockCliParser), std::move(mockPrinterService));
+
+    char* argv[] = {(char*)"ptprnt"};
+    app.init(1, argv);
+
+    int result = app.run();
+
+    EXPECT_EQ(result, 0);
+}
+
+// Test: run with printer selection failure
+TEST_F(PtouchPrintTest, RunPrinterSelectionFailure) {
+    ON_CALL(*printerServicePtr, selectPrinter(_)).WillByDefault(Return(nullptr));
+
+    cliParserPtr->options.commands.push_back({cli::CommandType::Text, "Test"});
+
+    PtouchPrint app("v1.0.0", std::move(mockCliParser), std::move(mockPrinterService));
+
+    char* argv[] = {(char*)"ptprnt"};
+    app.init(1, argv);
+
+    int result = app.run();
+
+    EXPECT_EQ(result, -1);
+}
+
+// Test: run with simple text command
+TEST_F(PtouchPrintTest, RunSimpleText) {
+    auto mockPrinter = std::make_shared<NiceMock<MockPrinterDriver>>();
+    PrinterInfo info{.driverName = "Test", .name = "Test", .version = "v1.0", .usbId = {0, 0}, .pixelLines = 128};
+    PrinterStatus status{.tapeWidthMm = 12};
+
+    ON_CALL(*mockPrinter, getPrinterInfo()).WillByDefault(Return(info));
+    ON_CALL(*mockPrinter, getPrinterStatus()).WillByDefault(Return(status));
+    ON_CALL(*mockPrinter, printLabel(_)).WillByDefault(Return(true));
+    ON_CALL(*printerServicePtr, selectPrinter(_)).WillByDefault(Return(mockPrinter));
+
+    cliParserPtr->options.commands.push_back({cli::CommandType::Text, "Hello"});
+
+    PtouchPrint app("v1.0.0", std::move(mockCliParser), std::move(mockPrinterService));
+
+    char* argv[] = {(char*)"ptprnt"};
+    app.init(1, argv);
+
+    int result = app.run();
+
+    EXPECT_EQ(result, 0);
+}
+
+// Test: run with font and text commands
+TEST_F(PtouchPrintTest, RunWithFormatting) {
+    auto mockPrinter = std::make_shared<NiceMock<MockPrinterDriver>>();
+    PrinterInfo info{.driverName = "Test", .name = "Test", .version = "v1.0", .usbId = {0, 0}, .pixelLines = 128};
+    PrinterStatus status{.tapeWidthMm = 12};
+
+    ON_CALL(*mockPrinter, getPrinterInfo()).WillByDefault(Return(info));
+    ON_CALL(*mockPrinter, getPrinterStatus()).WillByDefault(Return(status));
+    ON_CALL(*mockPrinter, printLabel(_)).WillByDefault(Return(true));
+    ON_CALL(*printerServicePtr, selectPrinter(_)).WillByDefault(Return(mockPrinter));
+
+    cliParserPtr->options.commands.push_back({cli::CommandType::Font, "monospace"});
+    cliParserPtr->options.commands.push_back({cli::CommandType::FontSize, "48"});
+    cliParserPtr->options.commands.push_back({cli::CommandType::Text, "Formatted"});
+
+    PtouchPrint app("v1.0.0", std::move(mockCliParser), std::move(mockPrinterService));
+
+    char* argv[] = {(char*)"ptprnt"};
+    app.init(1, argv);
+
+    int result = app.run();
+
+    EXPECT_EQ(result, 0);
+}
+
+// Test: run with alignment commands
+TEST_F(PtouchPrintTest, RunWithAlignment) {
+    auto mockPrinter = std::make_shared<NiceMock<MockPrinterDriver>>();
+    PrinterInfo info{.driverName = "Test", .name = "Test", .version = "v1.0", .usbId = {0, 0}, .pixelLines = 128};
+    PrinterStatus status{.tapeWidthMm = 12};
+
+    ON_CALL(*mockPrinter, getPrinterInfo()).WillByDefault(Return(info));
+    ON_CALL(*mockPrinter, getPrinterStatus()).WillByDefault(Return(status));
+    ON_CALL(*mockPrinter, printLabel(_)).WillByDefault(Return(true));
+    ON_CALL(*printerServicePtr, selectPrinter(_)).WillByDefault(Return(mockPrinter));
+
+    cliParserPtr->options.commands.push_back({cli::CommandType::HAlign, "center"});
+    cliParserPtr->options.commands.push_back({cli::CommandType::VAlign, "middle"});
+    cliParserPtr->options.commands.push_back({cli::CommandType::Text, "Centered"});
+
+    PtouchPrint app("v1.0.0", std::move(mockCliParser), std::move(mockPrinterService));
+
+    char* argv[] = {(char*)"ptprnt"};
+    app.init(1, argv);
+
+    int result = app.run();
+
+    EXPECT_EQ(result, 0);
+}
+
+// Test: run with invalid alignment (should handle gracefully)
+TEST_F(PtouchPrintTest, RunWithInvalidAlignment) {
+    auto mockPrinter = std::make_shared<NiceMock<MockPrinterDriver>>();
+    PrinterInfo info{.driverName = "Test", .name = "Test", .version = "v1.0", .usbId = {0, 0}, .pixelLines = 128};
+    PrinterStatus status{.tapeWidthMm = 12};
+
+    ON_CALL(*mockPrinter, getPrinterInfo()).WillByDefault(Return(info));
+    ON_CALL(*mockPrinter, getPrinterStatus()).WillByDefault(Return(status));
+    ON_CALL(*mockPrinter, printLabel(_)).WillByDefault(Return(true));
+    ON_CALL(*printerServicePtr, selectPrinter(_)).WillByDefault(Return(mockPrinter));
+
+    cliParserPtr->options.commands.push_back({cli::CommandType::HAlign, "invalid"});
+    cliParserPtr->options.commands.push_back({cli::CommandType::Text, "Test"});
+
+    PtouchPrint app("v1.0.0", std::move(mockCliParser), std::move(mockPrinterService));
+
+    char* argv[] = {(char*)"ptprnt"};
+    app.init(1, argv);
+
+    int result = app.run();
+
+    EXPECT_EQ(result, 0);  // Should handle gracefully
+}
+
+// Test: run with new label command
+TEST_F(PtouchPrintTest, RunWithNewLabel) {
+    auto mockPrinter = std::make_shared<NiceMock<MockPrinterDriver>>();
+    PrinterInfo info{.driverName = "Test", .name = "Test", .version = "v1.0", .usbId = {0, 0}, .pixelLines = 128};
+    PrinterStatus status{.tapeWidthMm = 12};
+
+    ON_CALL(*mockPrinter, getPrinterInfo()).WillByDefault(Return(info));
+    ON_CALL(*mockPrinter, getPrinterStatus()).WillByDefault(Return(status));
+    ON_CALL(*mockPrinter, printLabel(_)).WillByDefault(Return(true));
+    ON_CALL(*printerServicePtr, selectPrinter(_)).WillByDefault(Return(mockPrinter));
+
+    cliParserPtr->options.commands.push_back({cli::CommandType::Text, "First"});
+    cliParserPtr->options.commands.push_back({cli::CommandType::NewLabel, ""});
+    cliParserPtr->options.commands.push_back({cli::CommandType::Text, "Second"});
+
+    PtouchPrint app("v1.0.0", std::move(mockCliParser), std::move(mockPrinterService));
+
+    char* argv[] = {(char*)"ptprnt"};
+    app.init(1, argv);
+
+    int result = app.run();
+
+    EXPECT_EQ(result, 0);
+}
+
+// Test: run with verbose option
+TEST_F(PtouchPrintTest, RunWithVerbose) {
+    auto mockPrinter = std::make_shared<NiceMock<MockPrinterDriver>>();
+    PrinterInfo info{.driverName = "Test", .name = "Test", .version = "v1.0", .usbId = {0, 0}, .pixelLines = 128};
+    PrinterStatus status{.tapeWidthMm = 12};
+
+    ON_CALL(*mockPrinter, getPrinterInfo()).WillByDefault(Return(info));
+    ON_CALL(*mockPrinter, getPrinterStatus()).WillByDefault(Return(status));
+    ON_CALL(*mockPrinter, printLabel(_)).WillByDefault(Return(true));
+    ON_CALL(*printerServicePtr, selectPrinter(_)).WillByDefault(Return(mockPrinter));
+
+    cliParserPtr->options.verbose = true;
+    cliParserPtr->options.commands.push_back({cli::CommandType::Text, "Test"});
+
+    PtouchPrint app("v1.0.0", std::move(mockCliParser), std::move(mockPrinterService));
+
+    char* argv[] = {(char*)"ptprnt"};
+    app.init(1, argv);
+
+    int result = app.run();
+
+    EXPECT_EQ(result, 0);
+}
+
+// Test: run with trace option
+TEST_F(PtouchPrintTest, RunWithTrace) {
+    auto mockPrinter = std::make_shared<NiceMock<MockPrinterDriver>>();
+    PrinterInfo info{.driverName = "Test", .name = "Test", .version = "v1.0", .usbId = {0, 0}, .pixelLines = 128};
+    PrinterStatus status{.tapeWidthMm = 12};
+
+    ON_CALL(*mockPrinter, getPrinterInfo()).WillByDefault(Return(info));
+    ON_CALL(*mockPrinter, getPrinterStatus()).WillByDefault(Return(status));
+    ON_CALL(*mockPrinter, printLabel(_)).WillByDefault(Return(true));
+    ON_CALL(*printerServicePtr, selectPrinter(_)).WillByDefault(Return(mockPrinter));
+
+    cliParserPtr->options.trace = true;
+    cliParserPtr->options.commands.push_back({cli::CommandType::Text, "Test"});
+
+    PtouchPrint app("v1.0.0", std::move(mockCliParser), std::move(mockPrinterService));
+
+    char* argv[] = {(char*)"ptprnt"};
+    app.init(1, argv);
+
+    int result = app.run();
+
+    EXPECT_EQ(result, 0);
+}
+
+}  // namespace ptprnt

tests/usb_device_test/usb_device_test.cpp

@@ -0,0 +1,276 @@
+/*
+    ptrnt - print labels on linux
+    Copyright (C) 2025  Moritz Martinius
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+ */
+
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+
+#include <memory>
+
+#include "libusb.h"
+#include "libusbwrap/LibUsbTypes.hpp"
+#include "libusbwrap/UsbDevice.hpp"
+#include "mocks/MockLibUsbWrapper.hpp"
+
+using ::testing::_;
+using ::testing::DoAll;
+using ::testing::NiceMock;
+using ::testing::Return;
+using ::testing::SetArgPointee;
+
+namespace libusbwrap {
+
+// Test fixture for UsbDevice tests
+class UsbDeviceTest : public ::testing::Test {
+   protected:
+    void SetUp() override {
+        mockLibUsb = std::make_shared<NiceMock<MockLibUsbWrapper>>();
+
+        // Create mock device pointer
+        mockDevice = reinterpret_cast<libusb_device*>(0x1000);
+
+        // Create mock device handle
+        mockHandle = reinterpret_cast<libusb_device_handle*>(0x2000);
+
+        // Setup device descriptor
+        desc.idVendor  = 0x04f9;  // Brother vendor ID
+        desc.idProduct = 0x2042;  // P700 product ID
+
+        // Default behaviors
+        ON_CALL(*mockLibUsb, open(_, _)).WillByDefault(DoAll(SetArgPointee<1>(mockHandle), Return(0)));
+        ON_CALL(*mockLibUsb, getSpeed(_)).WillByDefault(Return(LIBUSB_SPEED_FULL));
+        ON_CALL(*mockLibUsb, getBusNumber(_)).WillByDefault(Return(1));
+        ON_CALL(*mockLibUsb, getPortNumber(_)).WillByDefault(Return(2));
+        ON_CALL(*mockLibUsb, errorName(_)).WillByDefault(Return("LIBUSB_SUCCESS"));
+    }
+
+    std::shared_ptr<MockLibUsbWrapper> mockLibUsb;
+    libusb_device* mockDevice;
+    libusb_device_handle* mockHandle;
+    libusb_device_descriptor desc{};
+};
+
+// Constructor tests
+TEST_F(UsbDeviceTest, ConstructorWithValidDevice) {
+    EXPECT_NO_THROW({
+        auto device = std::make_unique<UsbDevice>(mockDevice, desc, mockLibUsb);
+        EXPECT_NE(device, nullptr);
+    });
+}
+
+TEST_F(UsbDeviceTest, ConstructorWithNullptrThrows) {
+    EXPECT_THROW({ auto device = std::make_unique<UsbDevice>(nullptr, desc, mockLibUsb); }, std::invalid_argument);
+}
+
+// Open/Close tests
+TEST_F(UsbDeviceTest, OpenSuccess) {
+    auto device = std::make_unique<UsbDevice>(mockDevice, desc, mockLibUsb);
+
+    EXPECT_CALL(*mockLibUsb, open(mockDevice, _)).WillOnce(DoAll(SetArgPointee<1>(mockHandle), Return(0)));
+
+    EXPECT_TRUE(device->open());
+}
+
+TEST_F(UsbDeviceTest, OpenFailure) {
+    auto device = std::make_unique<UsbDevice>(mockDevice, desc, mockLibUsb);
+
+    EXPECT_CALL(*mockLibUsb, open(mockDevice, _)).WillOnce(Return(LIBUSB_ERROR_ACCESS));
+
+    EXPECT_FALSE(device->open());
+    EXPECT_EQ(device->getLastError(), Error::ACCESS);
+}
+
+TEST_F(UsbDeviceTest, CloseWithOpenDevice) {
+    auto device = std::make_unique<UsbDevice>(mockDevice, desc, mockLibUsb);
+    device->open();
+
+    EXPECT_CALL(*mockLibUsb, close(mockHandle)).Times(1);
+    device->close();
+}
+
+TEST_F(UsbDeviceTest, CloseWithoutOpenDevice) {
+    auto device = std::make_unique<UsbDevice>(mockDevice, desc, mockLibUsb);
+
+    // Should not call close if device was never opened
+    EXPECT_CALL(*mockLibUsb, close(_)).Times(0);
+    device->close();
+}
+
+TEST_F(UsbDeviceTest, DestructorClosesOpenDevice) {
+    EXPECT_CALL(*mockLibUsb, close(mockHandle)).Times(1);
+
+    {
+        auto device = std::make_unique<UsbDevice>(mockDevice, desc, mockLibUsb);
+        device->open();
+        // Device goes out of scope, destructor should call close
+    }
+}
+
+// Kernel driver tests
+TEST_F(UsbDeviceTest, DetachKernelDriverWhenActive) {
+    auto device = std::make_unique<UsbDevice>(mockDevice, desc, mockLibUsb);
+    device->open();
+
+    EXPECT_CALL(*mockLibUsb, kernelDriverActive(mockHandle, 0)).WillOnce(Return(1));  // Active
+    EXPECT_CALL(*mockLibUsb, detachKernelDriver(mockHandle, 0)).WillOnce(Return(0));  // Success
+
+    EXPECT_TRUE(device->detachKernelDriver(0));
+}
+
+TEST_F(UsbDeviceTest, DetachKernelDriverWhenNotActive) {
+    auto device = std::make_unique<UsbDevice>(mockDevice, desc, mockLibUsb);
+    device->open();
+
+    EXPECT_CALL(*mockLibUsb, kernelDriverActive(mockHandle, 0)).WillOnce(Return(0));  // Not active
+    EXPECT_CALL(*mockLibUsb, detachKernelDriver(_, _)).Times(0);                      // Should not call detach
+
+    EXPECT_TRUE(device->detachKernelDriver(0));
+}
+
+TEST_F(UsbDeviceTest, DetachKernelDriverFailure) {
+    auto device = std::make_unique<UsbDevice>(mockDevice, desc, mockLibUsb);
+    device->open();
+
+    EXPECT_CALL(*mockLibUsb, kernelDriverActive(mockHandle, 0)).WillOnce(Return(1));  // Active
+    EXPECT_CALL(*mockLibUsb, detachKernelDriver(mockHandle, 0)).WillOnce(Return(LIBUSB_ERROR_NOT_FOUND));
+
+    EXPECT_FALSE(device->detachKernelDriver(0));
+    EXPECT_EQ(device->getLastError(), Error::NOT_FOUND);
+}
+
+// Interface tests
+TEST_F(UsbDeviceTest, ClaimInterfaceSuccess) {
+    auto device = std::make_unique<UsbDevice>(mockDevice, desc, mockLibUsb);
+    device->open();
+
+    EXPECT_CALL(*mockLibUsb, claimInterface(mockHandle, 0)).WillOnce(Return(0));
+
+    EXPECT_TRUE(device->claimInterface(0));
+}
+
+TEST_F(UsbDeviceTest, ClaimInterfaceFailure) {
+    auto device = std::make_unique<UsbDevice>(mockDevice, desc, mockLibUsb);
+    device->open();
+
+    EXPECT_CALL(*mockLibUsb, claimInterface(mockHandle, 0)).WillOnce(Return(LIBUSB_ERROR_BUSY));
+
+    EXPECT_FALSE(device->claimInterface(0));
+    EXPECT_EQ(device->getLastError(), Error::BUSY);
+}
+
+TEST_F(UsbDeviceTest, ReleaseInterfaceSuccess) {
+    auto device = std::make_unique<UsbDevice>(mockDevice, desc, mockLibUsb);
+    device->open();
+
+    EXPECT_CALL(*mockLibUsb, releaseInterface(mockHandle, 0)).WillOnce(Return(0));
+
+    EXPECT_TRUE(device->releaseInterface(0));
+}
+
+TEST_F(UsbDeviceTest, ReleaseInterfaceFailure) {
+    auto device = std::make_unique<UsbDevice>(mockDevice, desc, mockLibUsb);
+    device->open();
+
+    EXPECT_CALL(*mockLibUsb, releaseInterface(mockHandle, 0)).WillOnce(Return(LIBUSB_ERROR_NOT_FOUND));
+
+    EXPECT_FALSE(device->releaseInterface(0));
+    EXPECT_EQ(device->getLastError(), Error::NOT_FOUND);
+}
+
+// Bulk transfer tests
+TEST_F(UsbDeviceTest, BulkTransferSuccess) {
+    auto device = std::make_unique<UsbDevice>(mockDevice, desc, mockLibUsb);
+    device->open();
+
+    std::vector<uint8_t> data = {0x01, 0x02, 0x03};
+    int transferred           = 0;
+
+    EXPECT_CALL(*mockLibUsb, bulkTransfer(mockHandle, 0x02, _, 3, _, 1000))
+        .WillOnce(DoAll(SetArgPointee<4>(3), Return(0)));
+
+    EXPECT_TRUE(device->bulkTransfer(0x02, data, &transferred, 1000));
+}
+
+TEST_F(UsbDeviceTest, BulkTransferFailure) {
+    auto device = std::make_unique<UsbDevice>(mockDevice, desc, mockLibUsb);
+    device->open();
+
+    std::vector<uint8_t> data = {0x01, 0x02, 0x03};
+    int transferred           = 0;
+
+    EXPECT_CALL(*mockLibUsb, bulkTransfer(mockHandle, 0x02, _, 3, _, 1000)).WillOnce(Return(LIBUSB_ERROR_TIMEOUT));
+
+    EXPECT_FALSE(device->bulkTransfer(0x02, data, &transferred, 1000));
+    EXPECT_EQ(device->getLastError(), Error::TIMEOUT);
+}
+
+// Getter tests
+TEST_F(UsbDeviceTest, GetUsbId) {
+    auto device = std::make_unique<UsbDevice>(mockDevice, desc, mockLibUsb);
+
+    auto usbId = device->getUsbId();
+    EXPECT_EQ(usbId.first, 0x04f9);   // vid
+    EXPECT_EQ(usbId.second, 0x2042);  // pid
+}
+
+TEST_F(UsbDeviceTest, GetSpeed) {
+    auto device = std::make_unique<UsbDevice>(mockDevice, desc, mockLibUsb);
+
+    EXPECT_CALL(*mockLibUsb, getSpeed(mockDevice)).WillOnce(Return(LIBUSB_SPEED_HIGH));
+
+    EXPECT_EQ(device->getSpeed(), device::Speed::HIGH);
+}
+
+TEST_F(UsbDeviceTest, GetBusNumber) {
+    auto device = std::make_unique<UsbDevice>(mockDevice, desc, mockLibUsb);
+
+    EXPECT_CALL(*mockLibUsb, getBusNumber(mockDevice)).WillOnce(Return(5));
+
+    EXPECT_EQ(device->getBusNumber(), 5);
+}
+
+TEST_F(UsbDeviceTest, GetPortNumber) {
+    auto device = std::make_unique<UsbDevice>(mockDevice, desc, mockLibUsb);
+
+    EXPECT_CALL(*mockLibUsb, getPortNumber(mockDevice)).WillOnce(Return(3));
+
+    EXPECT_EQ(device->getPortNumber(), 3);
+}
+
+TEST_F(UsbDeviceTest, GetLastError) {
+    auto device = std::make_unique<UsbDevice>(mockDevice, desc, mockLibUsb);
+
+    // Initially no error
+    EXPECT_EQ(device->getLastError(), Error::SUCCESS);
+
+    // After a failed operation
+    EXPECT_CALL(*mockLibUsb, open(_, _)).WillOnce(Return(LIBUSB_ERROR_NO_DEVICE));
+    device->open();
+
+    EXPECT_EQ(device->getLastError(), Error::NO_DEVICE);
+}
+
+TEST_F(UsbDeviceTest, GetLastErrorString) {
+    auto device = std::make_unique<UsbDevice>(mockDevice, desc, mockLibUsb);
+
+    EXPECT_CALL(*mockLibUsb, errorName(static_cast<int>(Error::SUCCESS))).WillOnce(Return("LIBUSB_SUCCESS"));
+
+    EXPECT_EQ(device->getLastErrorString(), "LIBUSB_SUCCESS");
+}
+
+}  // namespace libusbwrap