### Question:
DummyFault extends Fault implements Validator, Controller, Interceptor { @Override public void activate() { System.out.printf("dummy-%s is activated\n", id()); }  @Override void activate(); @Override void deactivate(); @Override Set<Violation> validate(); @Override boolean apply(Invocation invocation);  }### Answer:
@Test public void testActivate() { new DummyFault().activate(); }