Mockito:对间谍对象使用InOrder

Question

我想用mockito检查一些方法的调用顺序。我想要检查的方法之一是在模拟上，另一个是在我正在测试的真实类中，所以我使用一个spy对象来检查：

但是，mockito只知道对mock方法的调用，而不知道对spy对象的调用：

    MigrationServiceImpl migrationServiceSpy = spy(migrationServiceImpl);

    // I have tested without no more configuraitons on the spy, and also with the following
    // by separate (one by one)

    // I tried this:
    doNothing().when(migrationServiceSpy).updateCheckpointDate(eq(migration), any(Instant.class)); // In this case the call is not tracked by InOrder
    // And this:
    when(migrationServiceSpy.updateCheckpointDate(eq(migration), any(Instant.class))).thenReturn(true); // In this case the call is not tracked by InOrder
    // And this:
    when(migrationServiceSpy.updateCheckpointDate(eq(migration), any(Instant.class))).thenCallRealMethod(); // This line is throwing a null pointer exception but I don't understand why, since  if I do not spy the real object it works without failing.

    //Here I call the real method
    migrationServiceImpl.updateStatus(DEFAULT_MIGRATION_ID, inProgressStatus);

    InOrder inOrder = inOrder(migrationServiceSpy, mongoMigrationRunner);

    inOrder.verify(migrationServiceSpy).updateCheckpointDate(any(Migration.class), any(Instant.class));
    inOrder.verify(mongoMigrationRunner).runMigrationForInterval(any(Migration.class), anyString(), any(Instant[].class));

我能做什么?怎么回事？

Answer 1

解决方案是调用spy对象而不是真实对象：

migrationServiceSpy.updateStatus(DEFAULT_MIGRATION_ID, inProgressStatus);

而不是：

migrationServiceImpl.updateStatus(DEFAULT_MIGRATION_ID, inProgressStatus);