[video_player] Fix setWithOthers test (flutter#2970)

Author: Chris Yang

packages/video_player/video_player/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.10.12+2
+
+* Fix `setMixWithOthers` test.
+
 ## 0.10.12+1
 
 * Depend on the version of `video_player_platform_interface` that contains the new `VideoPlayerOptions` class.

packages/video_player/video_player/pubspec.yaml

@@ -4,7 +4,7 @@ description: Flutter plugin for displaying inline video with other Flutter
 # 0.10.y+z is compatible with 1.0.0, if you land a breaking change bump
 # the version to 2.0.0.
 # See more details: https://github.com/flutter/flutter/wiki/Package-migration-to-1.0.0
-version: 0.10.12+1
+version: 0.10.12+2
 homepage: https://github.com/flutter/plugins/tree/master/packages/video_player/video_player
 
 flutter:

packages/video_player/video_player/test/video_player_test.dart

@@ -579,11 +579,11 @@ void main() {
     expect(colors.backgroundColor, backgroundColor);
   });
 
-  test('setMixWithOthers', () {
+  test('setMixWithOthers', () async {
     final VideoPlayerController controller = VideoPlayerController.file(
         File(''),
         videoPlayerOptions: VideoPlayerOptions(mixWithOthers: true));
-    controller.initialize();
+    await controller.initialize();
     expect(controller.videoPlayerOptions.mixWithOthers, true);
   });
 }
@@ -656,6 +656,11 @@ class FakeVideoPlayerPlatform extends VideoPlayerApiTest {
   void setVolume(VolumeMessage arg) {
     calls.add('setVolume');
   }
+
+  @override
+  void setMixWithOthers(MixWithOthersMessage arg) {
+    calls.add('setMixWithOthers');
+  }
 }
 
 class FakeVideoEventStream {