Mockito：将 InOrder 与间谍对象一起使用

我想使用 mockito 检查某些方法的调用顺序。我想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，所以我使用间谍对象来检查：

然而，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？这是怎么回事？