Add Vulkan RHI minimal backend path

tests/RHI/unit/CMakeLists.txt

@@ -6,6 +6,7 @@ find_package(GTest REQUIRED)
 
 set(TEST_SOURCES
     fixtures/RHITestFixture.cpp
+    test_factory.cpp
     test_device.cpp
     test_buffer.cpp
     test_texture.cpp
@@ -30,7 +31,10 @@ set(TEST_SOURCES
 
 add_executable(rhi_unit_tests ${TEST_SOURCES})
 
-target_compile_definitions(rhi_unit_tests PRIVATE XCENGINE_SUPPORT_OPENGL)
+target_compile_definitions(rhi_unit_tests PRIVATE
+    XCENGINE_SUPPORT_OPENGL
+    XCENGINE_SUPPORT_VULKAN
+)
 
 target_link_libraries(rhi_unit_tests PRIVATE
     d3d12
@@ -42,6 +46,10 @@ target_link_libraries(rhi_unit_tests PRIVATE
     GTest::gtest_main
 )
 
+if(TARGET Vulkan::Vulkan)
+    target_link_libraries(rhi_unit_tests PRIVATE Vulkan::Vulkan)
+endif()
+
 target_include_directories(rhi_unit_tests PRIVATE
     ${CMAKE_CURRENT_SOURCE_DIR}/fixtures
     ${PROJECT_ROOT_DIR}/engine/include