PowerMockito：模拟上的NotAMockException [英] PowerMockito: NotAMockException on a mock

问题描述

有点复杂的设置。 Robolectric，PowerMockito基于规则的配置。

Bit of a complicated setup. Robolectric, PowerMockito rule-based config.

@RunWith(RobolectricGradleTestRunner.class)
@Config(constants = BuildConfig.class, sdk = 21)
@PowerMockIgnore({"org.mockito.*", "org.robolectric.*", "android.*"})
// Using "PrepareOnlyThis" prevents powermock from trying to instrument the whole hierarchy,
// part of which we've ignored (android.os.* in this case)
@PrepareOnlyThisForTest({ServiceCallbackBase.class}) // this class extends Handler, 
// so we need PrepareOnlyThis.  It also has some final methods we need to verify()
public class ServiceBaseTests {

  private class Foo {
    // nothing
  }

  @Rule
  public PowerMockRule rule = new PowerMockRule();

  private ServiceCallbackBase<Object, Foo> setupCallback( boolean hasValidContext, boolean allContextsCanceled ) {
    ServiceCallbackBase<Object, Foo> callback = PowerMockito.mock( ServiceCallbackBase.class );
    // EDIT:  I have converted these to PowerMockito.doReturn()s to no avail.
    PowerMockito.when( callback.hasValidContext() ).thenReturn( hasValidContext );
    PowerMockito.when( callback.allContextsAreCanceled( any( Message.class ) ) ).thenReturn( allContextsCanceled );
    PowerMockito.doNothing().when( callback ).preSendMessage( any( Message.class ) );
    return callback;
  }

应该很常规。但是，每当我尝试在这些回调模拟实例之一上调用 verify 时，例如：

Should be pretty routine. But whenever I try to call verify on one of these "callback" mock instances, for instance:

  private void test_notifyCallback( boolean isFromCache ) {
    ServiceCallbackBase<Object, Foo> callback = setupCallback( true, false );

    uut.addHandler( TestEnum.FOO, callback );
    uut.addHandler( TestEnum.BAR, PowerMockito.mock( ServiceCallbackBase.class ) );
    uut.addHandler( TestEnum.BAZ, PowerMockito.mock( ServiceCallbackBase.class ) );

    Response<Foo> foo = new Response<>( new Foo(), new ResponseStatus( 0, "Error" ) );
    uut.handleCallBack( TestEnum.FOO, foo, isFromCache );

    ArgumentCaptor<Message> captor = ArgumentCaptor.forClass( Message.class );

    // this line throws the error.  
    verify( callback ).preSendMessage( captor.capture() );

    assertThat( captor.getValue().what ).isEqualTo( TestEnum.FOO.ordinal() );
    assertThat( captor.getValue().obj ).isEqualTo( foo );
    assertThat( captor.getValue().arg1 ).isEqualTo( isFromCache ? 1 : 0 );
  }

我收到这样的错误：

org.mockito.exceptions.misusing.NotAMockException: 
Argument passed to verify() is of type ServiceCallbackBase$$EnhancerByMockitoWithCGLIB$$9acf906b and is not a mock!
Make sure you place the parenthesis correctly!
See the examples of correct verifications:
    verify(mock).someMethod();
    verify(mock, times(10)).someMethod();
    verify(mock, atLeastOnce()).someMethod();

mockito显然很明显地增强了，而PowerMock没有verify（）代替 Mockito.verify（） ...使用的方法是什么？

It's clearly and obviously been "enhanced" by mockito, and PowerMock doesn't have a verify() method to use instead of Mockito.verify()... what gives?

EDIT ：从某种程度上来说，这更加令人困惑。

EDIT: this is in some ways more and in some ways less confusing.

我正在构建另一个测试类来测试ServiceCallbackBase本身。如果我从该类中删除测试，则这些测试通过。不同类别中的以下代码片段导致上述测试失败。

I'm in the process of building another test class to test ServiceCallbackBase itself. If I remove the tests from that class, these tests pass. The following snippet in a different class causes the tests above to fail.

@RunWith(RobolectricGradleTestRunner.class)
@Config(constants = BuildConfig.class, sdk = 21)
public class ServiceCallbackBaseTests {

  @Test
  public void test_nothing(){

  }

  private ServiceCallbackBase<Object, String> uutSpy;


  @Before
  public void setup(){
    uutSpy = mock( ServiceCallbackBase.class );
  }
}

推荐答案

I无法建立您的示例，但我设法编写了一个导致非常相似问题的小型测试：

I cannot build your example, but I managed to write this minitest that produces a very similar problem:

@RunWith(RobolectricGradleTestRunner.class)
@Config(constants = BuildConfig.class, sdk = 21)
@PowerMockIgnore({"org.mockito.*", "org.robolectric.*", "android.*"})
@PrepareOnlyThisForTest({ServiceCallbackBase.class, Dummy.class})
public class MainActivityTest {

    @Rule
    public PowerMockRule rule = new PowerMockRule();

    @Test
    public void test1() throws Exception {
        try {
            //This Mockito.withSettings() thing is important to make the test fail!
            ServiceCallbackBase callback = PowerMockito.mock( ServiceCallbackBase.class, Mockito.withSettings());

            callback.dispatchMessage(null);
            Mockito.verify(callback).dispatchMessage(null);

        } catch (Exception e){
            e.printStackTrace();
            Assert.fail();
        }
    }
}

（请注意Mockito.withSettings （），我不知道为什么，但这会使测试失败）

(Note the Mockito.withSettings(), I don't know why but that makes the test to fail)

打印：

org.mockito.exceptions.misusing.NotAMockException: 
    Argument passed to verify() is of type ServiceCallbackBase$$EnhancerByMockitoWithCGLIB$$62776c54 and is not a mock!
    Make sure you place the parenthesis correctly!
    ......

好吧，这绝对是一个类加载问题，mockito正在将Powermock加载的ServiceCallbackBase $$ EnhancerByMockitoWithCGLIB $$ etc ..与Robolectric加载的ServiceCallbackBase $$ EnhancerByMockitoWithCGLIB $$ ..（显然，在该比较中返回false）

Well, this absolutely looks as a classloading issue, mockito is comparing ServiceCallbackBase$$EnhancerByMockitoWithCGLIB$$etc.. loaded by Powermock with the same loaded by Robolectric (obviously returning false in that comparision)

然后，我设法使测试工作只需将 org.powermock。* 添加到 @PowerMockIgnore ... 行，这是：

Then, I managed to make the test work simply adding "org.powermock.*"to the line @PowerMockIgnore... this is:

@PowerMockIgnore({"org.mockito.*", "org.robolectric.*", "android.*", "org.powermock.*"})

这个简单的更改使我的测试生效了，我真的希望也是你的。

This simple change made my test to work, and I really hope that make yours too.

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