Add OpenGL test infrastructure - Phase 1: Device, Buffer, Fence tests (17 tests)

- Create test directory structure at tests/RHI/OpenGL/
- Implement OpenGLTestFixture with GLFW/GLAD initialization
- Add Device tests: CreateRenderWindow, InitializeWithExistingWindow, GetDeviceInfo, SwapBuffers, PollEvents
- Add Buffer tests: VertexBuffer, IndexBuffer, UniformBuffer, Dynamic, Bind/Unbind, Map/Unmap
- Add Fence tests: Initialize (signaled/unsignaled), Signal, Wait, IsSignaled, GetStatus
- Add CMakeLists.txt with proper GLFW/GLAD/GTest linking
- Create implementation plan document at docs/OpenGL测试实施计划.md

tests/RHI/OpenGL/test_device.cpp

@@ -0,0 +1,63 @@
+#include "fixtures/OpenGLTestFixture.h"
+#include "XCEngine/RHI/OpenGL/OpenGLDevice.h"
+
+using namespace XCEngine::RHI;
+
+TEST_F(OpenGLTestFixture, Device_CreateRenderWindow_ValidParams) {
+    OpenGLDevice device;
+
+    bool result = device.CreateRenderWindow(800, 600, "Test Window", false);
+
+    ASSERT_TRUE(result);
+    ASSERT_NE(device.GetWindow(), nullptr);
+}
+
+TEST_F(OpenGLTestFixture, Device_CreateRenderWindow_DebugMode) {
+    OpenGLDevice device;
+
+    bool result = device.CreateRenderWindow(640, 480, "Debug Window", true);
+
+    ASSERT_TRUE(result);
+    ASSERT_NE(device.GetWindow(), nullptr);
+}
+
+TEST_F(OpenGLTestFixture, Device_InitializeWithExistingWindow) {
+    OpenGLDevice device;
+    GLFWwindow* existingWindow = GetWindow();
+
+    bool result = device.InitializeWithExistingWindow(existingWindow);
+
+    ASSERT_TRUE(result);
+    ASSERT_EQ(device.GetWindow(), existingWindow);
+}
+
+TEST_F(OpenGLTestFixture, Device_GetDeviceInfo_ReturnsValid) {
+    OpenGLDevice device;
+    device.CreateRenderWindow(800, 600, "Test", false);
+
+    const auto& info = device.GetDeviceInfo();
+
+    EXPECT_FALSE(info.vendor.empty());
+    EXPECT_FALSE(info.renderer.empty());
+    EXPECT_GE(info.majorVersion, 3);
+    EXPECT_GE(info.minorVersion, 0);
+}
+
+TEST_F(OpenGLTestFixture, Device_SwapBuffers_NoErrors) {
+    OpenGLDevice device;
+    device.CreateRenderWindow(800, 600, "Test", false);
+
+    device.SwapBuffers();
+
+    GLenum error = glGetError();
+    EXPECT_EQ(error, GL_NO_ERROR);
+}
+
+TEST_F(OpenGLTestFixture, Device_PollEvents_ReturnsTrue) {
+    OpenGLDevice device;
+    device.CreateRenderWindow(800, 600, "Test", false);
+
+    bool result = device.PollEvents();
+
+    EXPECT_TRUE(result);
+}