Java PowerMockito：如何模拟单身人士的私人成员

我尝试测试以下遗留单例类：

public class Controller {
   private handler = HandlerMgr.getHandler();
   public static final instance = new Controller();

   private Controller() {

   }

  public int process() {
     List<Request> reqs = handler.getHandler();
     ....
  }
}

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问题是HandlerMgr.getHandler（）仍然会被调用，我想绕过它并模拟它。

根据我的评论

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您的控制器调用getHandler，但设置GetRequest的期望值？这是 可能是为什么真正的方法会被调用

然后参考文档，您似乎缺少对mockStatic生成的存根的期望

根据PowerMock文档。。。请看下面

@Test
public void testRegisterService() throws Exception {
    long expectedId = 42;

    // We create a new instance of test class under test as usually.
    ServiceRegistartor tested = new ServiceRegistartor();

    // This is the way to tell PowerMock to mock all static methods of a
    // given class
    mockStatic(IdGenerator.class);

    /*
     * The static method call to IdGenerator.generateNewId() expectation.
     * This is why we need PowerMock.
     */
    expect(IdGenerator.generateNewId()).andReturn(expectedId);

    // Note how we replay the class, not the instance!
    replay(IdGenerator.class);

    long actualId = tested.registerService(new Object());

    // Note how we verify the class, not the instance!
    verify(IdGenerator.class);

    // Assert that the ID is correct
    assertEquals(expectedId, actualId);
}

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由于您的期望/设置缺少grtHandler，实际的方法仍然会被调用。

将@PrepareForTest（{HandlerMgr.class}）添加到测试类中。您

问题是HandlerMgr.getHandler（）仍然会被调用，我想绕过它并模拟它。您的控制器调用getHandler，但对GetRequest设置期望？这可能就是调用实际方法的原因？您需要在（HandlerMgr.getHandler（））时执行一些以

开头的存根操作。
@Test
public void testRegisterService() throws Exception {
    long expectedId = 42;

    // We create a new instance of test class under test as usually.
    ServiceRegistartor tested = new ServiceRegistartor();

    // This is the way to tell PowerMock to mock all static methods of a
    // given class
    mockStatic(IdGenerator.class);

    /*
     * The static method call to IdGenerator.generateNewId() expectation.
     * This is why we need PowerMock.
     */
    expect(IdGenerator.generateNewId()).andReturn(expectedId);

    // Note how we replay the class, not the instance!
    replay(IdGenerator.class);

    long actualId = tested.registerService(new Object());

    // Note how we verify the class, not the instance!
    verify(IdGenerator.class);

    // Assert that the ID is correct
    assertEquals(expectedId, actualId);
}