Add comprehensive tests for formatter classes, services, and utilities

- Introduced tests for various formatter classes including TextFormatter, DurationFormatter, SizeFormatter, DateFormatter, and more to ensure correct formatting behavior.
- Added tests for service classes such as FileTreeService, MetadataService, and RenameService, covering directory validation, metadata extraction, and file renaming functionalities.
- Implemented utility tests for LanguageCodeExtractor, PatternExtractor, and FrameClassMatcher to validate their extraction and matching capabilities.
- Updated test cases to use datasets for better maintainability and clarity.
- Enhanced error handling tests to ensure robustness against missing or invalid data.

renamer/test/test_fileinfo_extractor.py

@@ -10,8 +10,8 @@ class TestFileInfoExtractor:
 
     @pytest.fixture
     def test_file(self):
-        """Use the filenames.txt file for testing"""
-        return Path(__file__).parent / "filenames.txt"
+        """Use the filename_patterns.json dataset file for testing"""
+        return Path(__file__).parent / "datasets" / "filenames" / "filename_patterns.json"
 
     def test_extract_size(self, extractor):
         """Test extracting file size"""
@@ -29,10 +29,10 @@ class TestFileInfoExtractor:
         """Test extracting file name"""
         name = extractor.extract_file_name()
         assert isinstance(name, str)
-        assert name == "filenames.txt"
+        assert name == "filename_patterns.json"
 
     def test_extract_file_path(self, extractor):
         """Test extracting file path"""
         path = extractor.extract_file_path()
         assert isinstance(path, str)
-        assert "filenames.txt" in path
+        assert "filename_patterns.json" in path