BeforeClass (JUnit API)

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## org.junit
Annotation Type BeforeClass

    @Retention(value=RUNTIME)
    @Target(value=METHOD)
    public @interface BeforeClass

Sometimes several tests need to share computationally expensive setup (like logging into a database). While this can compromise the independence of tests, sometimes it is a necessary optimization. Annotating a `public static void` no-arg method with `@BeforeClass` causes it to be run once before any of the test methods in the class. The `@BeforeClass` methods of superclasses will be run before those the current class.

For example:

     public class Example {
        @BeforeClass public static void onlyOnce() {
           ...
        }
        @Test public void one() {
           ...
        }
        @Test public void two() {
           ...
        }
     }

See Also:
  `AfterClass`

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