public async void DeleteAlbum_ById_0_Returns_False() { var albumId = 0; For <IMediator>() .Setup(m => m.Send(It.IsAny <DeleteAlbumCommand>(), default(CancellationToken))) .Returns(Task.FromResult(false)).Verifiable(); var result = await ObjectUnderTest.DeleteAlbum(albumId); result.ShouldBeFalse(); For <IMediator>().Verify(); }