### Question:
ClientRegistry implements IClientRegistry, ClientRegistryMBean { public IClient lookupClient(String id) throws ClientNotFoundException { return getClient(id); } ClientRegistry();  ClientRegistry(String name); Client getClient(String id); ClientList<Client> getClientList(); boolean hasClient(String id); IClient lookupClient(String id); IClient newClient(Object[] params); String nextId(); String previousId();  }### Answer:
@Test public void testLookupClient() { IClient client = reg.lookupClient("0"); Assert.assertNotNull(client); }