title: Unit test assertion that is true in several cases
body: <p>I am trying to write a unit test where I check that a certain result is correct. However, there are two results that would be considered correct. Is there a way to do an OR with assertions?  I know that I could do result = x || result = y and assert that this is true.  But rather than seeing true != false, I would like to see result != x or y. </p>
  
  <p>The framework I am using is mstest, but I would be open to hearing suggestions for nunit as well.</p>