public async void ByVersionProjectId_Not_Exists() { var mock = new ServiceMockFacade <IReleaseRepository>(); mock.RepositoryMock.Setup(x => x.ByVersionProjectId(It.IsAny <string>(), It.IsAny <string>())).Returns(Task.FromResult <Release>(null)); var service = new ReleaseService(mock.LoggerMock.Object, mock.RepositoryMock.Object, mock.ModelValidatorMockFactory.ReleaseModelValidatorMock.Object, mock.BOLMapperMockFactory.BOLReleaseMapperMock, mock.DALMapperMockFactory.DALReleaseMapperMock); ApiReleaseResponseModel response = await service.ByVersionProjectId(default(string), default(string)); response.Should().BeNull(); mock.RepositoryMock.Verify(x => x.ByVersionProjectId(It.IsAny <string>(), It.IsAny <string>())); }