Add backpack editor startup scene

tests/Resources/Mesh/test_mesh_loader.cpp

@@ -1,4 +1,5 @@
 #include <gtest/gtest.h>
+#include <XCEngine/Core/Asset/ResourceManager.h>
 #include <XCEngine/Resources/Mesh/MeshLoader.h>
 #include <XCEngine/Resources/Mesh/MeshImportSettings.h>
 #include <XCEngine/Resources/Material/Material.h>
@@ -43,6 +44,16 @@ TEST(MeshLoader, LoadInvalidPath) {
     EXPECT_FALSE(result);
 }
 
+TEST(MeshLoader, ResourceManagerRegistersMeshAndTextureLoaders) {
+    ResourceManager& manager = ResourceManager::Get();
+    manager.Initialize();
+
+    EXPECT_NE(manager.GetLoader(ResourceType::Mesh), nullptr);
+    EXPECT_NE(manager.GetLoader(ResourceType::Texture), nullptr);
+
+    manager.Shutdown();
+}
+
 TEST(MeshLoader, LoadValidObjMesh) {
     MeshLoader loader;
     const std::string path = GetMeshFixturePath("triangle.obj");