### Question:
GuiceVerticleFactory implements VerticleFactory { @Override public String prefix() { return PREFIX; }  Injector getInjector(); GuiceVerticleFactory setInjector(Injector injector); @Override String prefix(); @Override Verticle createVerticle(String verticleName, ClassLoader classLoader); static final String PREFIX; }### Answer:
@Test public void testPrefix() { assertEquals("java-guice", factory.prefix()); }