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/constants/source_constants.py

@@ -0,0 +1,23 @@
+"""Video source type constants.
+
+This module defines video source types (WEB-DL, BDRip, etc.) and their aliases.
+"""
+
+SOURCE_DICT = {
+    "WEB-DL": ["WEB-DL", "WEBRip", "WEB-Rip", "WEB", "WEB-DLRip"],
+    "BDRip": ["BDRip", "BD-Rip", "BDRIP"],
+    "BDRemux": ["BDRemux", "BD-Remux", "BDREMUX"],
+    "DVDRip": ["DVDRip", "DVD-Rip", "DVDRIP"],
+    "HDTVRip": ["HDTVRip", "HDTV"],
+    "BluRay": ["BluRay", "BLURAY", "Blu-ray"],
+    "SATRip": ["SATRip", "SAT-Rip", "SATRIP"],
+    "VHSRecord": [
+        "VHSRecord",
+        "VHS Record",
+        "VHS-Rip",
+        "VHSRip",
+        "VHS",
+        "VHS Tape",
+        "VHS-Tape",
+    ],
+}