Nifty JUnit : Using Rule on Method and Class level

As shown in a the post Nifty JUnit : Working with temporary files, it is possible to use @Rule in a JUnit test, which is a Method level Rule. In this example I would like to show the variation of the @ClassRule for a Class level Rule.

Method Rule

The @Rule is fired before each test method (just like @Before) and after each test method (just like @After) of the test class, as shown in the example below.

Class Rule

Besides the regular @Rule we have the possibility to create a @ClassRule. In the example of the TemporaryFolder it will result in a folder which is created before all test methods (just like @BeforeClass) and destroyed after all test methods (just like @AfterClass). In the example below you can create a temporary file and use the exact same file in all the test methods. The temporary file will be deleted when all the test methods are finished.

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