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