refactor: reorganize unit tests into separate folder

- Move test_*.cpp and fixtures/ to tests/RHI/D3D12/unit/
- Create unit/CMakeLists.txt with proper test configuration
- Simplify parent CMakeLists.txt to use add_subdirectory
- Integration tests remain in integration/ folder

tests/RHI/D3D12/CMakeLists.txt

@@ -5,56 +5,7 @@ project(D3D12EngineTests)
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
-# 项目根目录 = tests/D3D12_engine/test/../../.. = XCEngine/
-get_filename_component(PROJECT_ROOT_DIR ${CMAKE_CURRENT_SOURCE_DIR}/../../.. ABSOLUTE)
-
-find_package(GTest REQUIRED)
-
-set(TEST_SOURCES
-    fixtures/D3D12TestFixture.cpp
-    test_device.cpp
-    test_fence.cpp
-    test_command_queue.cpp
-    test_command_allocator.cpp
-    test_command_list.cpp
-    test_buffer.cpp
-    test_texture.cpp
-    test_descriptor_heap.cpp
-    test_shader.cpp
-    test_root_signature.cpp
-    test_pipeline_state.cpp
-    test_views.cpp
-)
-
-add_executable(d3d12_engine_tests ${TEST_SOURCES})
-
-target_link_libraries(d3d12_engine_tests PRIVATE
-    d3d12
-    dxgi
-    d3dcompiler
-    XCEngine
-    GTest::gtest
-    GTest::gtest_main
-)
-
-target_include_directories(d3d12_engine_tests PRIVATE
-    ${CMAKE_CURRENT_SOURCE_DIR}/fixtures
-    ${PROJECT_ROOT_DIR}/engine/include
-    ${PROJECT_ROOT_DIR}/engine/src
-)
-
-target_compile_definitions(d3d12_engine_tests PRIVATE
-    TEST_RESOURCES_DIR="${PROJECT_ROOT_DIR}/tests/RHI/D3D12/integration/Res"
-)
-
-add_custom_command(TARGET d3d12_engine_tests POST_BUILD
-    COMMAND ${CMAKE_COMMAND} -E copy_directory
-    ${PROJECT_ROOT_DIR}/tests/RHI/D3D12/integration/Res
-    $<TARGET_FILE_DIR:d3d12_engine_tests>/Res
-)
+add_subdirectory(unit)
 
 # Integration tests
 add_subdirectory(integration)
-
-enable_testing()
-add_test(NAME D3D12EngineTests COMMAND d3d12_engine_tests)

tests/RHI/D3D12/unit/CMakeLists.txt

@@ -0,0 +1,51 @@
+cmake_minimum_required(VERSION 3.15)
+
+get_filename_component(PROJECT_ROOT_DIR ${CMAKE_CURRENT_SOURCE_DIR}/../../../.. ABSOLUTE)
+
+find_package(GTest REQUIRED)
+
+set(TEST_SOURCES
+    fixtures/D3D12TestFixture.cpp
+    test_device.cpp
+    test_fence.cpp
+    test_command_queue.cpp
+    test_command_allocator.cpp
+    test_command_list.cpp
+    test_buffer.cpp
+    test_texture.cpp
+    test_descriptor_heap.cpp
+    test_shader.cpp
+    test_root_signature.cpp
+    test_pipeline_state.cpp
+    test_views.cpp
+)
+
+add_executable(d3d12_engine_tests ${TEST_SOURCES})
+
+target_link_libraries(d3d12_engine_tests PRIVATE
+    d3d12
+    dxgi
+    d3dcompiler
+    XCEngine
+    GTest::gtest
+    GTest::gtest_main
+)
+
+target_include_directories(d3d12_engine_tests PRIVATE
+    ${CMAKE_CURRENT_SOURCE_DIR}/fixtures
+    ${PROJECT_ROOT_DIR}/engine/include
+    ${PROJECT_ROOT_DIR}/engine/src
+)
+
+target_compile_definitions(d3d12_engine_tests PRIVATE
+    TEST_RESOURCES_DIR="${PROJECT_ROOT_DIR}/tests/RHI/D3D12/integration/Res"
+)
+
+add_custom_command(TARGET d3d12_engine_tests POST_BUILD
+    COMMAND ${CMAKE_COMMAND} -E copy_directory
+    ${PROJECT_ROOT_DIR}/tests/RHI/D3D12/integration/Res
+    $<TARGET_FILE_DIR:d3d12_engine_tests>/Res
+)
+
+enable_testing()
+add_test(NAME D3D12EngineTests COMMAND d3d12_engine_tests)