public async Task PlayListController_GetPlayLists_Ok()
{
var db = _builder
.ConfigureInMemory()
.AddTenPlayLists()
.Build();
var repository = new Repository <Models.PlayList>(db);
var controller = new PlayListController(repository);
var response = (await controller.GetPlayLists())
.Result as OkObjectResult;
var values = response.Value as List <Models.PlayList>;
values.Count.Should().Be(10);
}