Mockito 错误 - 与此模拟的交互为零 Android

Question

我收到 通缉但未被调用。 verify(fingerPrintHelper, times(1)).initializeFingerPrint(any()); 行的 checkFingerPrintWhenTouchIdEnabled() 方法与此 mock 错误的交互为零 . 即使我在调试时模拟了对象，也调用了 initializeFingerPrint(..) 函数。

下面是我要测试的功能，

@RequiresApi(Build.VERSION_CODES.M)
public void checkFingerPrint() {
    if (fingerPrintHelper.isDeviceReadyForFingerPrint()) {
        boolean isFingerPrintEnable = sharedPreference.getBoolean(SpKeys.KEY_FINGER_PRINT, false);
        if (isFingerPrintEnable) {
            fingerPrintHelper.initializeFingerPrint(this);
        }
    } else {
        sharedPreference.putBoolean(SpKeys.KEY_FINGER_PRINT, false).commit();
    }
}

LoginActvity.java

public class LoginActivity extends AppCompatActivity {
public FingerPrintHelper fingerPrintHelper;
ActivityLoginBinding binding;
private LoginViewModel loginViewModel;
private SharedPreferenceManager sharedPreferenceManager;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    this.requestWindowFeature(Window.FEATURE_NO_TITLE);
    sharedPreferenceManager = new SharedPreferenceManager(getApplicationContext(), SpKeys.MY_SP);
    fingerPrintHelper = new FingerPrintHelper(this);
    binding = DataBindingUtil.setContentView(this, R.layout.activity_login);
    loginViewModel = ViewModelProviders.of(this).get(LoginViewModel.class);
    binding.setViewModel(loginViewModel);
    binding.setLifecycleOwner(this);

    checkFingerPrint();
}


@RequiresApi(Build.VERSION_CODES.M)
public void checkFingerPrint() {
    if (fingerPrintHelper.isDeviceReadyForFingerPrint()) {
        boolean isFingerPrintEnable = sharedPreferenceManager.getBoolean(SpKeys.KEY_FINGER_PRINT, false);
        if (isFingerPrintEnable) {
            fingerPrintHelper.initializeFingerPrint(this);
        }
    } else {
        sharedPreferenceManager.setBoolean(SpKeys.KEY_FINGER_PRINT, false);
    }
}
}

我正在为此函数编写正面和负面测试用例，而 checkFingerPrintWhenTouchIdDisabled() 测试工作正常，但我收到 checkFingerPrintWhenTouchIdEnabled() 测试函数的错误请参考下面的测试class

LoginActivityTest.java

public class LoginActivityTest {

LoginActivity loginActivity;
@Mock
FingerPrintHelper fingerPrintHelper;
@Rule
public ActivityTestRule<LoginActivity> loginActivityRule = new ActivityTestRule<>(
        LoginActivity.class);
Context context;

@Before
public void setUp() {
    MockitoAnnotations.initMocks(this);
    loginActivity = loginActivityRule.getActivity();
    context = getInstrumentation().getTargetContext();
}

@Test
public void checkFingerPrintWhenTouchIdDisabled() {

    SharedPreferences sharedPreferences = context.getSharedPreferences(SpKeys.MY_SP, Context.MODE_PRIVATE);
    when(fingerPrintHelper.isDeviceReadyForFingerPrint()).thenReturn(false);
    loginActivity.checkFingerPrint();
    Assert.assertFalse(sharedPreferences.getBoolean(SpKeys.KEY_FINGER_PRINT, false));
    verify(fingerPrintHelper, never()).initializeFingerPrint(any());

}
@Test
public void checkFingerPrintWhenTouchIdEnabled() {

    SharedPreferences sharedPreferences = context.getSharedPreferences(SpKeys.MY_SP, Context.MODE_PRIVATE);
    SharedPreferences.Editor preferencesEditor = sharedPreferences.edit();
    when(fingerPrintHelper.isDeviceReadyForFingerPrint()).thenReturn(true);
    preferencesEditor.putBoolean(SpKeys.KEY_FINGER_PRINT, true).commit();

    loginActivity.checkFingerPrint();

    /* Below verification for `initializeFingerPrint()` is throwing error as,
    Actually, there were zero interactions with this mock. error,
    Even I have mock the object & while debugging the method is getting invoked also.
    If I debug my code it calls this function but in test cases it shows above error
    */
    verify(fingerPrintHelper, times(1)).initializeFingerPrint(any());
}
}

那为什么我的测试用例会出现 零交互 错误？可能是什么问题，我们将不胜感激。

提前致谢。

Answer 1

您没有在测试用例的任何地方注入模拟。我假设在构造函数/工厂中创建了一个普通实例。

使用 SUT 的 setter 或让 Mockito 为您注入：

@InjectMocks
LoginActivity loginActivity;

仅使用 @Mock 是不够的。

Answer 2

尝试以下方法手动设置模拟（不使用注释）：

@Before
public void setUp() {
    loginActivity = loginActivityRule.getActivity();
    loginActivity.fingerPrintHelper = Mockito.mock(FingerPrintHelper.class);
    // ...
}

如果loginAcitivy之前可以创建成功，现在应该不会有问题了。
而且 fingerPrintHelper 似乎是 public，所以它很容易设置。
但是如果你想正确地设置它，你可以提供一个 setter。

或者如果你想保留注释来创建fingerPrintHelper。

@Mock
FingerPrintHelper fingerPrintHelper;

@Before
public void setUp() {
    MockitoAnnotations.initMocks(this);
    loginActivity = loginActivityRule.getActivity();
    loginActivity.fingerPrintHelper = fingerPrintHelper;
    // ...
}

Still I would like to know the reason behind keeping loginActivity.fingerPrintHelper = fingerPrintHelper line.

mock 不会神奇地将自己附加到任何其他对象。

@InjectMocks 会为你做到这一点，但 Mockito 似乎无法自行处理 LoginActivity 的创建。

所以你唯一能做的就是手动将 mock 传递给被测对象。

Mockito 错误 - 与此模拟的交互为零 Android

Mockito error- There were zero interactions with this mock Android

java

android

mockito

testcase

android-testing