Add unit tests for MediaInfo frame class detection

- Created a JSON file containing various test cases for different video resolutions and their expected frame classes.
- Implemented a pytest test script that loads the test cases and verifies the frame class detection functionality of the MediaInfoExtractor.
- Utilized mocking to simulate the behavior of the MediaInfoExtractor and its video track attributes.

renamer/test/test_mediainfo_frame_class.py

@@ -0,0 +1,40 @@
+#!/usr/bin/env python3
+"""Test script for MediaInfo frame class detection by resolution"""
+
+import json
+import pytest
+from unittest.mock import MagicMock
+import sys
+import os
+sys.path.insert(0, os.path.join(os.path.dirname(__file__), '..'))
+
+from renamer.extractors.mediainfo_extractor import MediaInfoExtractor
+
+test_cases = json.load(open('renamer/test/test_mediainfo_frame_class.json'))
+
+@pytest.mark.parametrize("test_case", test_cases, ids=[tc['testname'] for tc in test_cases])
+def test_frame_class_detection(test_case):
+    """Test frame class detection for various resolutions"""
+    
+    testname = test_case['testname']
+    width, height = test_case['resolution']
+    interlaced = test_case['interlaced']
+    expected = test_case['expected_frame_class']
+    
+    # Create a mock MediaInfoExtractor
+    extractor = MagicMock(spec=MediaInfoExtractor)
+    from pathlib import Path
+    extractor.file_path = Path(f"test_{testname}")  # Set a unique file_path for caching
+    
+    # Mock the video_tracks
+    mock_track = MagicMock()
+    mock_track.height = height
+    mock_track.width = width
+    mock_track.interlaced = 'Yes' if interlaced else 'No'
+    
+    extractor.video_tracks = [mock_track]
+    
+    # Test the method
+    actual = MediaInfoExtractor.extract_frame_class(extractor)
+    
+    assert actual == expected, f"{testname}: expected {expected}, got {actual}"