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); }