Microsoft® Visual Studio® 2010 Unleashed

Testing Your Exceptions

You should write unit tests to verify your code behaves as expected in both positive and negative conditions. The positive conditions can be verified using the Assert methods as discussed previously. However, many times you want to verify that your code returns the correct exception when you call or use it in a certain manner. In this case, you can use the ExpectedException attribute to test for specific error conditions.

You use the ExpectedException attribute by adding it to a test method. The attribute takes the type of expected exception as a parameter. If the test method results in an exception being thrown and the type of that exception is as you defined in the attribute then the test is considered a success. If ...