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

Reviewed-on: #21

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