feat: Add movie database identifier extraction and update related tests

renamer/test/filenames.txt

@@ -255,3 +255,9 @@ The Holdovers (2023) [1080p,ukr,eng].mkv
 Killers of the Flower Moon (2023) [2160p,HDR,ukr,eng].mkv
 Poor Things (2023) [1080p,ukr,eng].mkv
 Anatomy of a Fall (2023) [720p,ukr,eng].mkv
+Star Wars: Episode IV - A New Hope (1977) [1080p,ukr,eng].mkv
+
+Грицькові книжки.(1979).[ukr].{imdb-tt9007536}.mpg
+Гуси-Лебеді.(1949).[ukr,2rus].{imdb-tt1070792}.mkv
+Apple 1984 (1984) [Remastered] [2160p,eng] [imdbid-tt4227346].mkv
+Harley Quinn. A Very Problematic Valentine's Day Special (2023) WEB-DL [1080p,ukr,eng] [imdbid-tt22525032].mkv

renamer/test/test_filename_extractor.py

@@ -79,4 +79,21 @@ def test_extract_hdr(filename):
     print(f"\nFilename: \033[1;36m{filename}\033[0m")
     print(f"Extracted HDR: \033[1;32m{hdr}\033[0m")
     # HDR should be 'HDR' or None
-    assert hdr is None or hdr == 'HDR'
+    assert hdr is None or hdr == 'HDR'
+
+
+@pytest.mark.parametrize("filename", load_test_filenames())
+def test_extract_movie_db(filename):
+    """Test movie database identifier extraction from filename"""
+    file_path = Path(filename)
+    extractor = FilenameExtractor(file_path)
+    movie_db = extractor.extract_movie_db()
+    # Print filename and extracted movie DB clearly
+    print(f"\nFilename: \033[1;36m{filename}\033[0m")
+    print(f"Extracted movie DB: \033[1;32m{movie_db}\033[0m")
+    # Movie DB should be tuple (str, str) or None
+    if movie_db:
+        assert isinstance(movie_db, tuple) and len(movie_db) == 2
+        assert isinstance(movie_db[0], str) and isinstance(movie_db[1], str)
+    else:
+        assert movie_db is None