Question

I have the following method that I would like to unit test:

public void Upload(string identifier, Stream data)
{
    var startTime = SystemTime.Now;

    innerDataIntegrationInterface.Upload(identifier, data);

    var endTime = SystemTime.Now;

    TimeSpan totalUploadTime = endTime.Subtract(startTime);
    float transferRate = data.Length / (float)(totalUploadTime.Seconds + totalUploadTime.Milliseconds);

    m_log.Info(string.Format("Total uploading time for '{0}' was {1:00}.{2:000000} milliseconds transfered at {3} bytes/sec", identifier, totalUploadTime.Seconds, totalUploadTime.Milliseconds, transferRate));
}

Basically I am already injecting the SystemTime object so I can set it up in my test but I can’t figure out what to do so that the startTime and endTime variables get different values so I can assert that the m_log.Info method gets called with the correct values for the totalUploadTime and transferRate variables.

Any ideas would be appreciated.

Answer 1

Can you make your Mock SystemTime object increment it’s value in the Now Getter? That would make them different.