### Question:
ZookeeperRegistryProvider implements RegistryProvider { @Override public RegistryService provide() { return ZookeeperRegisterServiceImpl.getInstance(); }  @Override RegistryService provide();  }### Answer:
@Test public void provide() { ZookeeperRegistryProvider provider = new ZookeeperRegistryProvider(); Assertions.assertTrue(provider.provide() instanceof ZookeeperRegisterServiceImpl); }