如何模拟 URLconnection 以便我可以更改 java 中 getLastModified 方法的 return 值？

Question

如何模拟 URLconnection 以便我可以更改 getLastModified 方法的 return 值？我尝试了几种不同的方法，例如

  @Spy
    Watcher watcher;

    @Mock
    URLConnection connection;

    @Test
    void status() throws IOException {
        Mockito.mock(connection.getClass());
        doReturn(connection).when(watcher).create(any());
        doReturn((long) 3).when(connection).getLastModified();

        Watcher watcher = new Watcher();

        URL url = new URL("http://www.google.ats");
        ConcreteObserver obs1 = new ConcreteObserver(watcher, url);
}

在观察者中 class 我会

public URLConnection create(URL url) throws IOException {
        URLConnection connect = url.openConnection();
        return connect;
    }

还有一些检查 LastModifiedDate 的方法。但是我最后修改的日期总是 returns 值 0.

Answer 1

可能是这样的……

    // No need for a spy

    @Test
    void status(
        @Mock final URL urlMock,
        @Mock final URLConnection urlConnectionMock
    ) throws Exception {

        // given: The desired URL-related mocking
        when(urlMock.openConnection)
            .thenReturn(urlConnectionMock);

        when(urlConnectionMock.getLastModified())
            .thenReturn(3L);

        // and:
        final Watcher watcher = new Watcher();

        // and:
        final ConcreteObserver obs1 = new ConcreteObserver(watcher, url);
        

        // when: The action to be tested happens
        ...


        // then: Assert/verify the results
        ...
    }

祝你好运！

如何模拟 URLconnection 以便我可以更改 java 中 getLastModified 方法的 return 值？

How to mock URLconnection so that I can change the return value for getLastModified method in java?

java

mocking

mockito