public async Task GetArtistSongsStats_WhenArtistNameIsEmpty_ShouldReturnBadRequest() { _artistServiceMock.Setup(_ => _.GetArtistSongsStats(It.IsAny <string>())).Returns(Task.FromResult(new ArtistSongsStats())); var response = await _artistController.GetArtistSongsStats(""); response.Should().BeOfType <BadRequestObjectResult>(); }