public void NoPRSErrorsHaveOccured_ReturnsZero()
        {
            int      numberOfErrorsFound = 0;
            DateTime previousMinute      = DateTime.Now.AddMinutes(-1);

            numberOfErrorsFound  = _repository.ReturnErrorCountInPreviousMinute(previousMinute, UnableToContactPRSError);
            numberOfErrorsFound += _repository.ReturnErrorCountInPreviousMinute(previousMinute, PRSTimeoutError);

            Assert.AreEqual(0, numberOfErrorsFound);
        }