Junit hidden feature

I was surprised to see how many hidden and undocumented features Junit has. In the new release (4.7) you have access to a lot of interesting stuff (still in development for some).

Running tests in parallel (by using a scheduling strategy)

public static class Example {
 @Test public void one() throws InterruptedException {
  Thread.sleep(1000);
 }
 @Test public void two() throws InterruptedException {
  Thread.sleep(1000);
 }
}

@Test public void testsRunInParallel() {
 long start= System.currentTimeMillis();
 Result result= JUnitCore.runClasses(ParallelComputer.methods(),
   Example.class);
 assertTrue(result.wasSuccessful());
 long end= System.currentTimeMillis();
 assertThat(end - start, betweenInclusive(1000, 1500));
}

See here for more details.

Intercept test method call with @Rule

public static class HasGlobalTimeout {
    public static String log;
    
    @Rule
    public MethodRule globalTimeout= new Timeout(20);
       
    @Test
    public void testInfiniteLoop1() {
        log+= "ran1";
        for (;;) {...}
    }
   
    @Test
    public void testInfiniteLoop2() {
        log+= "ran2";
        for (;;) {...}
    }
}

See here for more details.