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** Branch linked: lp:nunit-3.0

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https://bugs.launchpad.net/bugs/897289

Title:
  Is.Empty constraint has unclear failure message

Status in NUnit Test Framework:
  Fix Committed
Status in NUnit V2 Test Framework:
  Fix Committed

Bug description:
  Using v2.6 b2.

      var emptyEnumerable = GetEmptyIEnumerable();
      var emptyString = GetEmptyString();

      Assert.That(emptyEnumerable, Is.Empty);
      Assert.That(emptyString, Is.Empty);

  If the methods under test in the above example return 'null' instead
  of the expected string or IEnumerable, the failure message states
  "System.ArgumentException: The actual value must be an IEnumerable".

  At least the test is failing correctly, so the problem's not too bad,
  but it can be slightly non-intuitive to fix the test, especially when
  the actual value being tested is a string.

  I'd expect it either to say "The actual value must be an IEnumerable
  or a string", or it to give a more precise answer, something like "The
  actual value was not empty" / "not empty but null".

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