fix(video_player): improve audio track format handling in tests

- Simplified mock format descriptions in VideoPlayerTests to prevent Core Media crashes
- Removed unnecessary mock format description setup that could cause test instability
- Updated format description validation to only accept genuine Core Media objects, removing NSObject fallback
- Fixed potential crash when accessing format descriptions in test environment

Author: nateshmbhat

packages/video_player/video_player_avfoundation/darwin/RunnerTests/VideoPlayerTests.m

@@ -1058,13 +1058,9 @@ - (void)testGetAudioTracksWithRegularAssetTracks {
   OCMStub([mockTrack2 languageCode]).andReturn(@"es");
   OCMStub([mockTrack2 estimatedDataRate]).andReturn(96000.0f);
 
-  // Mock format descriptions for track 1
-  id mockFormatDesc1 = OCMClassMock([NSObject class]);
-  AudioStreamBasicDescription asbd1 = {0};
-  asbd1.mSampleRate = 48000.0;
-  asbd1.mChannelsPerFrame = 2;
-
-  OCMStub([mockTrack1 formatDescriptions]).andReturn(@[ mockFormatDesc1 ]);
+  // Mock empty format descriptions to avoid Core Media crashes in test environment
+  OCMStub([mockTrack1 formatDescriptions]).andReturn(@[]);
+  OCMStub([mockTrack2 formatDescriptions]).andReturn(@[]);
 
   // Mock the asset to return our tracks
   NSArray *mockTracks = @[ mockTrack1, mockTrack2 ];

packages/video_player/video_player_avfoundation/darwin/video_player_avfoundation/Sources/video_player_avfoundation/FVPVideoPlayer.m

@@ -580,14 +580,9 @@ - (nullable FVPNativeAudioTrackData *)getAudioTracks:(FlutterError *_Nullable *_
           NSString *className = NSStringFromClass([formatDescObj class]);
 
           // Only process objects that are clearly Core Media format descriptions
-          // This works for both real CMFormatDescription objects and properly configured mock
-          // objects
           if ([className hasPrefix:@"CMAudioFormatDescription"] ||
               [className hasPrefix:@"CMVideoFormatDescription"] ||
-              [className hasPrefix:@"CMFormatDescription"] ||
-              [formatDescObj
-                  isKindOfClass:[NSObject
-                                    class]]) {  // Allow mock objects that inherit from NSObject
+              [className hasPrefix:@"CMFormatDescription"]) {
 
             CMFormatDescriptionRef formatDesc = (__bridge CMFormatDescriptionRef)formatDescObj;