Testing for exceptions with [TestCase] attribute in NUnit 3?

Question

How do I test for exceptions in a TestCase with NUnit3?

Let\'s say I have a method Divide(a,b) defined as follows:

public d         


        

Answer 1

I agree with the Corpus Gigantus's answer but why don't you simplify thing like this:

[TestCase(-10, 2, -5)]
[TestCase(-1, 2, -0.5)]
[TestCase(-1, 0, null, typeof(ArgumentException))]
public void TestDivide(double a, double b, double result, Type exception = null)
{
    if(exception != null)
    {
        Assert.Throws(exception, delegate { _uut.Divide(a, b);  });
                
    } else Assert.That(_uut.Divide(a, b), Is.EqualTo(result));
}

In this way, the expected exception is part of the test parameters as well, note that you can only have two outcome, either the division succeeds or throws.