2009-05-30 New ExpectedException model in NUnit 2.5

2009-05-30 new-expectedexception-model-in-nunit-25

# Title: New ExpectedException model in NUnit 2.5
# Author: Mikael Lundin
# Link: http://blog.mikaellundin.name/2009/05/30/new-expectedexception-model-in-nunit-25.html

Example1.cs

[TestMethod]
[ExpectedException(typeof(NullReferenceException))]
public void NullReferenceExceptionTestInMsTest()
{
    /* Setup */
    string[] names = null;
    int numberOfNames = 0;

    /* Test */
    numberOfNames = names.Length;
}

Example2.cs

[Test(Description = "Testing the new ExpectedException functionality in NUnit 2.5")]
public void NullReferenceExceptionTest()
{
    /* Setup */
    string[] names = null;
    int numberOfNames = 0;

    /* Assert */
    Assert.Throws<NullReferenceException>(

        /* Test */
        () => numberOfNames = names.Length);

    /* Assert that numberOfNames is still zero */
    Assert.That(numberOfNames == 0);
}

Example3.cs

[Test(Description = "Testing the new ExpectedException functionality in NUnit 2.5")]
public void NullReferenceExceptionTest()
{
    /* Setup */
    string[] names = null;
    int numberOfNames = 0;

    /* Test */
    TestDelegate throwingCode = () => numberOfNames = names.Length;

    /* Assert */
    Assert.Throws<NullReferenceException>(throwingCode);

    /* Assert that numberOfNames is still zero */
    Assert.That(numberOfNames == 0);
}