Tolerance and the Equal constraint in NUnit tests

Those pesky tests that fail every once and a while because something took slightly longer than usual. Sure you could just run them again and they probably pass a second time round. There is another simple way to avoid this, the NUnit Within modifier for the Equal constraint.

[Test]
public void CreationDateTimeIsSetOnConstruction()
{
   var timeObject= new TimeClass();
   
   Assert.That(timeObject.CreationDateTime, Is.EqualTo(DateTime.Now)
         .Within(new TimeSpan(2000)));
}