public async Task <LessonDto> Lesson_AddLesson_Return_LessonDTO() { CreateDefaultDeviceServiceInstance(); var addLesson = _mapper.Map <AddLessonDto>(_fakeTimetable[0]); var lessonDto = await _timetableService.AddLesson(addLesson, default(CancellationToken)); Assert.NotNull(lessonDto); return(lessonDto); }