NUnit Assert.AreEqual DateTime Tolerances

I'm wondering if anybody's found a good solution to this:

In our unit tests; we commonly use Assert.AreEqual() to validate our results. All is well and good; until we start trying to use this on DateTime properties.

Although the times are very similar, sometimes they are off by milliseco开发者_如何学Gonds, which causes the tests to fail. In our application; as long as they're accurate to the second; that's good enough for us.

Has anybody found a good way to somehow implement tolerances in this case? Typically our workaround is to split it into 2 separate statements; one which checks the .ToShortDateString(), and another that checks .ToShortTimeString(), but this looks sloppy in my opinion.

Use Assert.That and Is.Equal constraint instead of Assert.AreEqual. Below is a code sample from the Nunit website itself

DateTime now = DateTime.Now;
DateTime later = now + TimeSpan.FromHours(1.0);

Assert.That(now, Is.EqualTo(now) );
Assert.That(later, Is.EqualTo(now).Within(TimeSpan.FromHours(3.0)));
Assert.That(later, Is.EqualTo(now).Within(3).Hours);

You can check tolerances with something like:

Debug.Assert((date1 - date2) < TimeSpan.FromSeconds(1));

If you are unsure which date is newer, use

Debug.Assert(Math.Abs((date1 - date2).TotalSeconds) < 1)

NUnit has also added built in support for this using the Within keyword

DateTime now = DateTime.Now;
DateTime later = now + TimeSpan.FromHours(1.0);

Assert.That(later, Is.EqualTo(now).Within(TimeSpan.FromHours(3.0)));
Assert.That(later, Is.EqualTo(now).Within(3).Hours);

To correctly check if any 2 arbitrary dates are equals to within a 1 second tolerance, the following is a correct solution:

Debug.Assert(Math.Abs((date1 - date2).TotalSeconds) < 1)

I figured I'd add this as a solution since the accepted solution was incorrect when date2 is larger than date1 by more than a second, and the solution has not been updated following my comment to @SwDevMan81.