public async void TestPlayAudioFile()
{
var context = new MockContext <IPlayAudio>();
context.Arrange(m => m.PlayAudioAsync("id", The <PlayAudioData> .Is(d => IsValidPlayAudioFileData(d)), null))
.Returns(Task.FromResult(0));
var instance = new PlayAudio(context);
await instance.PlayAudioFileAsync("id", "url");
}