@Override
    public boolean enable(String pluginId) {
        return false;
    }
@Test
    public void testEnable() {
        ThreadPoolPlugin plugin = new TestPlugin();
        Assert.assertFalse(manager.enable(plugin.getId()));
        manager.register(plugin);
        Assert.assertFalse(manager.enable(plugin.getId()));
        manager.disable(plugin.getId());
        Assert.assertFalse(manager.enable(plugin.getId()));
    }