public void TestDeleteCalendarAndApropriateCalendarDays() { SqlCalendar sql = new SqlCalendar(); sql.DeleteCalendarAndApropriateCalendarDays(1); IEnumerable <ClassCalendarDay> query = from elem in sql.ListOfCalendarDays(1) select elem; Assert.Empty(query); IEnumerable <ClassCalendar> query2 = from elem in sql.CalendarList() where elem.CalendarId == 1 select elem; Assert.Empty(query2); }