public async Task <IEnumerable <IEnumerable <LessonDto> > > Lesson_GetFilteredTimetable_Return_IEnumerableIEnumerableLessonDTO() { CreateDefaultDeviceServiceInstance(); var lessonDto = await _timetableService.GetFilteredTimetable(new LessonFilter(), default(CancellationToken)); Assert.NotNull(lessonDto); Assert.True(Equals(lessonDto.Count(), 1)); return(lessonDto); }