How to execute a method when a test fails

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+1 Q:

How to execute a method when a test fails

I am unit-testing a a .NET project using visual studio's own framework where each test needs to close certain connections so that the next test may run correctly. However, when a test fails, this cleanup is not performed, and as a result all subsequent tests fail.

Is there a way I can execute a method everytime a test fails?

+4 A:

Try to put your cleanup logic into a method decorated by the [TestCleanUp] attribute.

See the MSDN for details.

Romain Verdier 2010-07-14 13:23:07

How can I pass parameters to such a method? Also, ideally I would like to define a global variable at the [ClassInitialize] method, but it doesn't let me see the property I just defined. The property shows up in [TestCleanUp]. How come?

sbenderli 2010-07-14 13:25:47

@sbenderli: You can't. It's similar to a [TestMethod] in that it's automatically located and called by the test engine. The [TestCleanup] method in a class is called *after* each test completes, to clean up. Likewise, the [TestInitialize] method is executed *before* each test to set up the pre-test state of the test fixture.

Toby 2010-07-14 13:30:01

You can't, and you shouldn't. this method, as well as `TestInitialize`, is automatically called by the testing engine. You still can use fields of your test fixture class. i.e. You create a `_connection` member in your class, you initialize the connection in the `[TestInitialize]` method, then you close it in the `[TestCleanUp]` method.

Romain Verdier 2010-07-14 13:32:04

@Romain, that's exactly what I did now and it's excellent for my purposes. Thanks!

sbenderli 2010-07-14 13:33:52

Only do this if you connection member is used by all (/most) of your tests. If not try/finally blocks.

mlk 2010-07-14 15:06:23

ansaurus

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How to execute a method when a test fails

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