Question

//member of some class example "myclass"
private final IBinder mICallBack = new Binder();

现在我的问题是，当我创建myclass对象时，它正在调用android.os.Binder的本机方法。

我想要的是模拟IBinder.class并使用我的模拟对象来抑制新对象的创建。

如何嘲笑这个？

Answer 1

EasyMock中有一个用于模拟本机方法的示例。希望能帮助到你。可以在github存储库中找到源代码here。

package samples.nativemocking;

/**
 * The purpose of this class is to demonstrate that it's possible to mock native
 * methods using plain EasyMock class extensions.
 */
public class NativeService {

    public native String invokeNative(String nativeParameter);

}


package samples.nativemocking;

/**
 * The purpose of this class is to invoke a native method in a collaborator.
 */
public class NativeMockingSample {

    private final NativeService nativeService;

    public NativeMockingSample(NativeService nativeService) {
        this.nativeService = nativeService;
    }

    public String invokeNativeMethod(String param) {
        return nativeService.invokeNative(param);
    }
}

package samples.junit4.nativemocking;

import org.junit.Test;
import samples.nativemocking.NativeMockingSample;
import samples.nativemocking.NativeService;

import static org.easymock.EasyMock.*;
import static org.junit.Assert.assertEquals;

/**
 * This test demonstrates that it's possible to mock native methods using plain
 * EasyMock class extensions.
 */
public class NativeMockingSampleTest {

    @Test
    public void testMockNative() throws Exception {
        NativeService nativeServiceMock = createMock(NativeService.class);
        NativeMockingSample tested = new NativeMockingSample(nativeServiceMock);

        final String expectedParameter = "question";
        final String expectedReturnValue = "answer";
        expect(nativeServiceMock.invokeNative(expectedParameter)).andReturn(expectedReturnValue);

        replay(nativeServiceMock);

        assertEquals(expectedReturnValue, tested.invokeNativeMethod(expectedParameter));

        verify(nativeServiceMock);
    }
}

Answer 2

这应该可以解决问题：

@RunWith(PowerMockRunner.class)
@PrepareForTest(Binder.class)
public class ClassTest {
  @Mock
  private Binder binderMock;

  @Before
  public void init(){
     MockitoAnnotations.initMocks(this);
  }

  @Test
  public void doSomething() throws Exception {
      // Arrange    
      PowerMockito.whenNew(Binder.class).withNoArguments()
         .thenReturn(binderMock);

      //.. rest of set-up and invocation
  }

}

如何模仿私人最终成员

2 个答案: