update unit tests

CMakeLists.txt

@@ -70,6 +70,7 @@ ADD_EXECUTABLE(
   tests/irregularity_test.cpp
   tests/enums_test.cpp
   tests/core_test.cpp
+  tests/files_test.cpp
 )
 
 TARGET_LINK_LIBRARIES(

tests/files_test.cpp

+#include "../src/lib/files.hpp"
+#include <gtest/gtest.h>
+
+using namespace files;
+
+TEST(Files, SaveFile) {
+    std::string content = "test";
+    std::filesystem::path fileName = "tests/test.txt";
+    save_file(fileName, content);
+    std::ifstream file(fileName);
+    std::string line;
+    std::getline(file, line);
+    EXPECT_EQ(line, content);
+    file.close();
+    std::filesystem::remove(fileName);
+}
+
+TEST(Files, GetFilenameAndExtension) {
+    std::string videoPath = "tests/images/test_scene_01.jpg";
+    std::pair<std::string, std::string> result = get_filename_and_extension(videoPath);
+    EXPECT_EQ(result.first, "test_scene_01");
+    EXPECT_EQ(result.second, "jpg");
+}
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