如何对依赖ZooKeeper的代码写单元测试

日常开发中,如何使用了ZooKeeper,在对这部分做单元测试的时候,往往很不方便,因为实际安装一个ZooKeeper专门用来做单元测试,实在是太浪费。这种情况下,可以使用curator-testcurator是Netflix公司开源的一个Zookeeper客户端,curator-test正是其中的一员,通过它可以Mock一个本地(127.0.0.1)ZooKeeper Server用于测试,非常方便。

Maven Dependency

<dependency>
    <groupId>org.apache.curator</groupId>
    <artifactId>curator-test</artifactId>
    <version>2.6.0</version>
    <scope>test</scope>
</dependency>

Getting Started

private static TestingServer server;
private static CuratorFramework client;

@BeforeClass
public static void setUpBeforeClass() throws Exception {
    server = new TestingServer(2181, true);
    server.start();
    
    client = CuratorFrameworkFactory.newClient("127.0.0.1",
            new ExponentialBackoffRetry(1000, 3));
    client.start();
}

@AfterClass
public static void tearDownAfterClass() throws IOException {
    server.stop();
    client.close();
}

@Test
public void testFoobar() throws Exception {
    System.out.println("client: " + client);
    client.create().forPath("/test", "test-data".getBytes());

    byte[] data = client.getData().forPath("/test");
    System.out.println("data: " + new String(data));
}
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