if ok, msg := assertCallbacks(createCallback, []string{"c3", "c1", "c2", "c4"}); !ok {
		t.Errorf("callbacks tests failed, got %v", msg)
	}

	// plugin 3
	createCallback.Before("*").Register("plugin_3_fn1", c5)
	if ok, msg := assertCallbacks(createCallback, []string{"c5", "c3", "c1", "c2", "c4"}); !ok {
		t.Errorf("callbacks tests failed, got %v", msg)
	}

	createCallback.After("*").Register("plugin_3_fn2", c6)