embedded zookeeper for unit/integration test

Question

Is there an embedded zookeeper so that we could use it in unit testing? It can be shipped with the test and run out of the box. Maybe we could mock some service and register to

Answer 1

You could use Apache Curator Utilities provided in-process ZooKeeper server TestingServer that can be used for testing. With maven you can dependency as follows

    
        org.apache.curator
        curator-test
        3.2.1
    

And you can create in process zookeeper server as folows

 TestingServer zkServer;

  @Before
  public void setUp() throws Exception
  {
    zkServer = new TestingServer(2181, true);
  }

  @After
  public void tearDown() throws Exception
  {
    zkServer.stop();
  }

For testing Cluster use can use TestingCluster, which creates an internally running ensemble of ZooKeeper servers