PowerMockito.doReturn 返回 null

2022-01-14 00:00:00 unit-testing mockito java junit powermockito

这是我正在测试的课程:

This is my class under test:

public class A {

public Integer callMethod(){
  return someMethod();
}


private Integer someMethod(){
  //Some Code
  HttpPost httpPost = new HttpPost(oAuthMessage.URL);
  //Some Code
  HttpClient httpClient = new DefaultHttpClient();
  HttpResponse httpResponse = httpClient.execute(httpPost); ------1
  Integer code = httpResponse.getStatusLine().getStatusCode(); ---2
  return code;
}

现在我想模拟第 1 行 &2&返回一个模拟 HttpResponse &代码.

Now I want to mock the line 1 & 2 & return a mock HttpResponse & code.

我试过这个但失败了:

@RunWith(PowerMockRunner.class)
@PowerMockIgnore("javax.crypto.*")
public class TestA {

//Spying some things here & Injecting them

@Test
public void testA() {


   DefaultHttpClient defaultHttpClientMock = PowerMockito.mock(DefaultHttpClient.class);
   HttpResponse httpResponse = PowerMockito.mock(HttpResponse.class, RETURNS_DEEP_STUBS);
   HttpClient httpClient = PowerMockito.mock(HttpClient.class);
   //HttpResponse httpResponseMock    PowerMockito.mock(HttpResponse.class);
   HttpPost httpPost = PowerMockito.mock(HttpPost.class);
   PowerMockito.whenNew(DefaultHttpClient.class).withNoArguments().thenReturn(defaultHttpClientMock);
   PowerMockito.doReturn(httpResponse).when(httpClient).execute(httpPost);      //Returns null. It never returns httpResponse.
   PowerMockito.when(httpResponse.getStatusLine().getStatusCode()).thenReturn(anyInt());
   //call the method
}

PowerMockito.doReturn(httpResponse).when(httpClient).execute(httpPost) 总是返回 null.我希望它返回 HttpResponse 的模拟对象.我已阅读与此错误相关的其他帖子，但不确定在我的情况下该怎么做.有人可以帮忙吗?

PowerMockito.doReturn(httpResponse).when(httpClient).execute(httpPost) always returns null. I want it to return the mock object of HttpResponse. I have read other posts related to this error but not sure what to do in my case. Can anyone help?

推荐答案

代替

PowerMockito.doReturn(httpResponse).when(httpClient).execute(httpPost);

你应该使用

PowerMockito.when(httpResponse.execute(httpPost)).thenReturn(httpResponse);

您的测试中还有一些问题:不正确的模拟构造函数，您根本不需要 httpResponse.

You also have some problems in your test : incorrect mocking constructor and you don't need httpResponse at all.

更新此代码对我来说可以正常工作:

Update This code works correctly to me: 

@RunWith(PowerMockRunner.class)
@PowerMockIgnore("javax.crypto.*")
@PrepareForTest({ HttpPost.class, DefaultHttpClient.class, A.class })
public class TestA {

    @Test
    public void testA() throws Exception {
        HttpPost httpPost = Mockito.mock(HttpPost.class);
        PowerMockito.whenNew(HttpPost.class).withArguments(oAuthMessage.URL).thenReturn(httpPost);

        DefaultHttpClient defaultHttpClientMock = PowerMockito.mock(DefaultHttpClient.class);
        HttpResponse httpResponse = PowerMockito.mock(HttpResponse.class);
        PowerMockito.whenNew(DefaultHttpClient.class).withNoArguments().thenReturn(defaultHttpClientMock);

        PowerMockito.when(defaultHttpClientMock.execute(httpPost)).thenReturn(httpResponse);

        StatusLine statusLine = PowerMockito.mock(StatusLine.class);

        PowerMockito.when(httpResponse.getStatusLine()).thenReturn(statusLine);
        Integer expected = new Integer(0);
        PowerMockito.when(statusLine.getStatusCode()).thenReturn(expected);

        A a = new A();
        Assert.assertEquals(expected, a.callMethod());
    }
}

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