Add GetWorld to Actor. Integrate google test. Add Model manager class. Rename *.h to *.hpp files

Tests/CMakeLists.txt

@@ -0,0 +1,24 @@
+include(FetchContent)
+FetchContent_Declare(
+	googletest
+	URL https://github.com/google/googletest/archive/refs/tags/v1.15.0.zip
+	DOWNLOAD_EXTRACT_TIMESTAMP true
+)
+set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
+FetchContent_MakeAvailable(googletest)
+
+enable_testing()
+
+file(GLOB SRC "UStringTest.cpp" "${PROJECT_SOURCE_DIR}/Core/Types/UString.cpp")
+
+add_executable(Tests ${SRC})
+target_link_libraries(Tests PRIVATE 
+	GTest::gtest_main
+)
+target_include_directories(Tests PRIVATE
+	${PROJECT_SOURCE_DIR}/Core
+)
+
+
+include(GoogleTest)
+gtest_discover_tests(Tests)

Tests/UStringTest.cpp

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+#include <gtest/gtest.h>
+#include "Types/UString.hpp"
+#include <cstring>
+
+TEST(UStringTest, creae_string)
+{
+    UString str("Hello, World!");
+    EXPECT_EQ(str, "Hello, World!");
+    EXPECT_NE(str, "Hello, UwU!");
+    EXPECT_EQ(str.length(), 13);
+}
+
+TEST(UStringTest, concatenate_string)
+{
+    UString str1("Hello, ");
+    UString str2("World!");
+    str1 += str2;
+    EXPECT_EQ(str1, "Hello, World!");
+    EXPECT_EQ(str1.length(), 13);
+
+    UString str3("Hello, ");
+    str3 += "UwU!";
+    EXPECT_EQ(str3, "Hello, UwU!");
+    EXPECT_EQ(str3.length(), 11);
+}