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/moviedb_constants.py

@@ -0,0 +1,32 @@
+"""Movie database identifier constants.
+
+This module defines movie and TV database services (TMDB, IMDB, Trakt, TVDB)
+and their identifier patterns.
+"""
+
+MOVIE_DB_DICT = {
+    "tmdb": {
+        "name": "The Movie Database (TMDb)",
+        "description": "Community built movie and TV database",
+        "url": "https://www.themoviedb.org/",
+        "patterns": ["tmdbid", "tmdb", "tmdbid-", "tmdb-"],
+    },
+    "imdb": {
+        "name": "Internet Movie Database (IMDb)",
+        "description": "Comprehensive movie, TV, and celebrity database",
+        "url": "https://www.imdb.com/",
+        "patterns": ["imdbid", "imdb", "imdbid-", "imdb-"],
+    },
+    "trakt": {
+        "name": "Trakt.tv",
+        "description": "Service that integrates with media centers for scrobbling",
+        "url": "https://trakt.tv/",
+        "patterns": ["traktid", "trakt", "traktid-", "trakt-"],
+    },
+    "tvdb": {
+        "name": "The TV Database (TVDB)",
+        "description": "Community driven TV database",
+        "url": "https://thetvdb.com/",
+        "patterns": ["tvdbid", "tvdb", "tvdbid-", "tvdb-"],
+    },
+}