registry.register(new ObjectSubscriber());
    assertEquals(2, registry.getSubscribersForTesting(String.class).size());
    assertEquals(1, registry.getSubscribersForTesting(Object.class).size());
  }

  public void testUnregister() {
    StringSubscriber s1 = new StringSubscriber();
    StringSubscriber s2 = new StringSubscriber();

    registry.register(s1);
    registry.register(s2);

    registry.unregister(s1);

    assertEquals("The dead event must not be re-wrapped.", EVENT, events.get(0).getEvent());
  }

  public void testMissingSubscribe() {
    bus.register(new Object());
  }

  public void testUnregister() {
    StringCatcher catcher1 = new StringCatcher();
    StringCatcher catcher2 = new StringCatcher();
    assertThrows(IllegalArgumentException.class, () -> bus.unregister(catcher1));

    bus.register(catcher1);

    assertEquals("The dead event must not be re-wrapped.", EVENT, events.get(0).getEvent());
  }

  public void testMissingSubscribe() {
    bus.register(new Object());
  }

  public void testUnregister() {
    StringCatcher catcher1 = new StringCatcher();
    StringCatcher catcher2 = new StringCatcher();
    assertThrows(IllegalArgumentException.class, () -> bus.unregister(catcher1));

    bus.register(catcher1);

    }

    // Test default constructor
    @Test
    public void test_constructor() {
        assertNotNull(testScriptEngine);
    }

    // Test register method
    @Test
    public void test_register() {
        testScriptEngine.register();

        // Verify that the engine was registered with the factory
        ScriptEngine retrievedEngine = scriptEngineFactory.getScriptEngine("testEngine");

        String queryString = builder.toString();
        assertFalse(queryString.contains("important_content"));
    }

    @Test
    public void test_register() {
        // Save the original processor
        QueryProcessor originalProcessor = ComponentUtil.getQueryProcessor();

        try {
            // Create a new QueryProcessor and initialize it

        } else {
            // For DefaultQueryBuilder, we just verify it was created
            assertTrue(result instanceof DefaultQueryBuilder);
        }
    }

    @Test
    public void test_register() {
        // Test that register method properly registers the command with QueryProcessor
        BoostQueryCommand newCommand = new BoostQueryCommand();
        newCommand.register();