public async Task VideoGetByIdCorrectly()
{
var videoList = new List <Video>();
var videoRepo = new Mock <IDeletableEntityRepository <Video> >();
videoRepo.Setup(x => x.All()).Returns(videoList.AsQueryable());
videoRepo.Setup(x => x.AddAsync(It.IsAny <Video>()))
.Callback((Video x) => videoList.Add(x));
await videoRepo.Object.AddAsync(this.test);
var videoService = new VideosService(videoRepo.Object);
var videoResult = videoService.GetById(this.test.Id);
Assert.Equal(test, videoResult);
}