NUnit TestCaseSource

c# nunit testcasesource
DanB picture DanB · Jul 30, 2012 · Viewed 8.5k times · Source

I'm having a go with the TestCaseSource attribute. One problem: when the sourceName string is invalid, the test just gets ignored instead of failing. This would be really bad if the source method gets renamed, the sourceName string doesn't get updated, and then you lose the coverage that the test provided. Is there a way to change the behaviour of NUnit, so that the test fails if the sourceName is invalid?

Answer

TrueWill picture TrueWill · Apr 17, 2013

This is resolved in NUnit 2.6.2. There is a new constructor for the attribute that takes a Type (which must implement IEnumerable); it "is recommended for use in preference to other forms because it doesn't use a string to specify the data source and is therefore more easily refactored." (From the documentation.)

This does require that your test runner supports the latest NUnit.

A very basic example (see the above documentation link for more details):

public class TestDataProvider : IEnumerable
{
    public IEnumerator GetEnumerator()
    {
        return new List<int>{ 2, 4, 6 }.GetEnumerator();
    }
}

[TestFixture]
public class MyTests
{
    [TestCaseSource(typeof(TestDataProvider))]
    public void TestOne(int number)
    {
        Assert.That(number % 2, Is.EqualTo(0));
    }
}

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