double.NaN Equality in MS Test
- by RichK
Why am I getting this result?
[TestMethod]
public void nan_test()
{
Assert.AreEqual(1, double.NaN, 1E-1); <-- Passes
Assert.AreEqual(1, double.NaN); <-- Fails
}
What difference does the delta have in asserting NaN equals a number? Surely it should always return false. I am aware of IsNaN, but that's not useful here (see below).
Background: I have a function returning NaN (erroneously) , it was meant to be a real number but the test still passed. I'm using the delta because it's double precision equality, the original test used 1E-9.
