java - Mockito 想要但没有调用实用程序类

Question

我正在为我的应用程序中的类进行单元测试，它只是一个简单的类，我认为我做的一切都是正确的，但测试失败了

Wanted but not invoked: mContextWeakReference.get(); -> at rahmat.com.app.utility.backwardcompatibility.StringResourceUtilTest.getString(StringResourceUtilTest.java:40) Actually, there were zero interactions with this mock.

这是要测试的类

public class StringResourceUtil {

private static StringResourceUtil sInstance;

private WeakReference<Context> mContextWeakReference;

public static StringResourceUtil getInstance() {
    return sInstance;
}

@Inject
public StringResourceUtil(Context context) {
    mContextWeakReference = new WeakReference<>(context);
    sInstance = this;   //NOSONAR
}

public String getString(int resId) {
    return mContextWeakReference.get().getString(resId);
}}

这是我做的单元测试

public class StringResourceUtilTest {


private StringResourceUtil mResourceUtil;

@Mock
private Context mContext;

@Mock
private WeakReference<Context> mContextWeakReference;

@Before
public void setUp(){
    MockitoAnnotations.initMocks(this);
    mResourceUtil = new StringResourceUtil(mContext);
}


@Test
public void getString() {
    int resId = 123;
    mResourceUtil.getString(resId);
    verify(mContextWeakReference).get().getString(eq(resId));
}}

非常感谢任何帮助，谢谢

Answer 1

你的 StringUtil 类总是创建一个新的 mContextWeakReference 对象，即使你正在创建它，它也不会自动注入(inject)(因为你使用 injectMock 但在这里没有用，因为新对象的创建总是在内部发生)。

public class StringResourceUtilTest {


    private StringResourceUtil mResourceUtil;

    @Mock
    private Context mContext;

    @Before
    public void setUp(){
        MockitoAnnotations.initMocks(this);
        mResourceUtil = new StringResourceUtil(mContext);
        // setup mock return type
        // mock objects are not real,so need to moeck the behavior of method as well
        when(mContext.getString(R.string.a123)).thenReturn("123");
    }


    @Test
    public void getString() {
        int resId = R.string.a123;
        // check the return type
        assertEquals("123",mResourceUtil.getString(resId));
    }
}

注意:要验证内部工作，请阅读

What is the difference between mocking and spying when using Mockito?