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>()));
}