public async void LessonXStudents_Not_Exists() { var mock = new ServiceMockFacade <ILessonRepository>(); mock.RepositoryMock.Setup(x => x.LessonXStudents(default(int), It.IsAny <int>(), It.IsAny <int>())).Returns(Task.FromResult <List <LessonXStudent> >(new List <LessonXStudent>())); var service = new LessonService(mock.LoggerMock.Object, mock.RepositoryMock.Object, mock.ModelValidatorMockFactory.LessonModelValidatorMock.Object, mock.BOLMapperMockFactory.BOLLessonMapperMock, mock.DALMapperMockFactory.DALLessonMapperMock, mock.BOLMapperMockFactory.BOLLessonXStudentMapperMock, mock.DALMapperMockFactory.DALLessonXStudentMapperMock, mock.BOLMapperMockFactory.BOLLessonXTeacherMapperMock, mock.DALMapperMockFactory.DALLessonXTeacherMapperMock); List <ApiLessonXStudentResponseModel> response = await service.LessonXStudents(default(int)); response.Should().BeEmpty(); mock.RepositoryMock.Verify(x => x.LessonXStudents(default(int), It.IsAny <int>(), It.IsAny <int>())); }