无法验证 Mockito 中的俘虏

Question

写了下一个测试：

private val mockContext = Mockito.mock(Context::class.java)
private val notificationManager = Mockito.mock(NotificationManager::class.java)

@RequiresApi(Build.VERSION_CODES.O)
@Test
@Throws(Exception::class)
fun clearNotificationsTest() {
    Mockito.`when`(mockContext.getSystemService(Context.NOTIFICATION_SERVICE)).thenReturn(notificationManager)

    val captor: ArgumentCaptor<NotificationChannel> = ArgumentCaptor.forClass(NotificationChannel::class.java)

    mockContext.registerNotificationChannels()

    Mockito.verify(notificationManager.createNotificationChannel(captor.capture()))

    val argument: NotificationChannel = captor.value

    assertThat(argument.id, equalTo(CHANNEL_ID))
    assertThat(argument.name.toString(), equalTo(CHANNEL_NAME))
    assertThat(argument.importance, equalTo(NotificationManagerCompat.IMPORTANCE_HIGH))
}

并在我的 verify 中获取下一个错误：

org.mockito.exceptions.misusing.NotAMockException: Argument passed to verify() is of type Unit 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();

Answer 1

你是怎么定义的

notificationManager

使用 MockitoAnnotations，您可以在测试中定义一个字段，如下所示

@Mock
NotificationManager notificationManager

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

注意： 监视 class 它必须是模拟对象或已被监视的真实对象在。即

  val notificationManagerSpy: spy(notificationManager)

如果您使用的是 Robolectric you will have a real ShadowNotificationManager 等测试框架，那么您应该监视真实对象。解决方案如下：

@RequiresApi(Build.VERSION_CODES.O)
@Test
@Throws(Exception::class)
fun clearNotificationsTest() 
{
   val notificationManagerSpy: spy(notificationManager)
   Mockito.`when`(mockContext.getSystemService(Context.NOTIFICATION_SERVICE))
      .thenReturn(notificationManagerSpy)

    val captor: ArgumentCaptor<NotificationChannel> = 
      ArgumentCaptor.forClass(NotificationChannel::class.java)

    mockContext.registerNotificationChannels()


    Mockito.verify(notificationManagerSpy
    .createNotificationChannel(captor.capture()))

    val argument: NotificationChannel = captor.value

    assertThat(argument.id, equalTo(CHANNEL_ID))
    assertThat(argument.name.toString(), equalTo(CHANNEL_NAME))
    assertThat(argument.importance, 
    equalTo(NotificationManagerCompat.IMPORTANCE_HIGH))

请参阅：https://www.baeldung.com/mockito-spy 了解更多关于间谍以及什么是有效的可间谍对象的信息。

Answer 2

这就是你使用 mock 编写验证的方式

Mockito.verify(notificationManager).createNotificationChannel(captor.capture()));

无法验证 Mockito 中的俘虏

Can't verify captor in Mockito

android

verify

mockito