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

Reviewed-on: #21

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