Creating an annotation of my own to extend JUnit4 behaviour

I've been looking 开发者_StackOverflow社区for resources on how to extend JUnit4 with my own annotations.

I'd like to be able to define a @ExpectedProblem with which I could label some of my tests. I've seen there seems to be some material on the net on how to extend TestNG, but I could fine none to extend JUnit4.

Has anyone here extended JUnit4 in the past?

Thanks

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Depending on what you want your @ExpectedProblem annotation to do, another option is to create a @Rule.

This requires JUnit 4.7+, but should be simpler than implementing your own Runner.

For instance, if you want an annotation to say, "this test should throw an exception" then you'll want to take a look at the @ExpectedException rule. Even if that's not enough for your needs it can provide a good starting point for implementing your own rule.

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Basic approach is to create your own class runner. For instance, by extending the org.junit.runners.ParentRunner or org.junit.runners.BlockJUnit4ClassRunner classes. You would then annotate your test class with @RunWith(<your class runner>.class). In your runner, you could then analyze the test-class to check for annotations and take appropriate actions etc. Found this googling: http://tedyoung.me/2011/01/23/junit-runtime-tests-custom-runners/

This is how Spring modeled their JUnit support, using the org.springframework.test.context.junit4.SpringJUnit4ClassRunner