Why do MSTests Assert.AreEqual(1.0, double.NaN, 0.0) pass?

Posted by Egil Hansen on Stack Overflow See other posts from Stack Overflow or by Egil Hansen
Published on 2009-11-22T21:07:02Z Indexed on 2010/05/13 17:24 UTC
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mstest

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double

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nan

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.NET

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assert

Short question, why do Assert.AreEqual(1.0, double.NaN, 0.0) pass when Assert.AreEqual(1.0, double.NaN) do not?

Is it an error in MSTest or am I missing something here?

Best regards, Egil.

Update: Should probably add, that the reason behind my question is, that I have a bunch of unit tests that unfortunately passed due to the result of some linear algebraic matrix operation being NaN or (+/-)Infinity. The unit tests are fine, but since Assert.AreEqual on doubles with a delta will pass when actual or/and expected are NaN or Infinity, I was left to believe that the code I was testing was correct.

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