public void FindByBetweenDates_DatesDoNotHaveTermsWithinThem_NonexistingEntityExceptionIsThrown()
{
// arrange
var startDate = new DateTime(2019, 1, 1);
var endDate = new DateTime(2019, 5, 29);
// act and assert
var ex = Assert.Throws <NonexistingEntityException>(() => _termService.FindByBetweenDates(startDate, endDate));
Assert.AreEqual("There are no terms in the current date range.", ex.Message);
}