@Test public void subscribingToInterfacesFails() {
      try {
        new Bus(ThreadEnforcer.ANY).register(new InterfaceSubscriber());
        fail("Annotation finder allowed subscription to illegal interface type.");
      } catch (IllegalArgumentException expected) {
        // Do nothing.
      }
    }
Test that Bus finds the correct handlers.

This test must be outside the c.g.c.eventbus package to test correctly.

@author Louis Wasserman
otto/src/test/java/com/squareup/otto/outside/AnnotatedHandlerFinderTest.java