Dipak Chandran P Dipak Chandran P - 5 months ago 10
Java Question

How does Junit @Rule work?

I want to write test cases for a bulk of code, I would like to know details of JUnit

@Rule
annotation feature, so that I can use it for writing test cases. Please provide some good answers or links, which give detailed description of its functionality through a simple example.

Answer

Rules are used to add additional functionality which applies to all tests within a test class, but in a more generic way.

For instance, ExternalResource executes code before and after a test method, without having to use @Before and @After. Using an ExternalResource rather than @Before and @After gives opportunities for better code reuse; the same rule can be used from two different test classes.

The design was based upon: Interceptors in JUnit

For more information see JUnit wiki : Rules.

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