Mock methods about mockito

[kjawadDeveloper]

@srawlins how we can do such testing?

[TedSander]

You can use thenAnswer. It isn't quite as nice, but spy was not going to work without reflection.

final ft = new FooExample();
final mock = new MockFooExample();

  test('calculate', () {
    when(mock.myCalc()).thenReturn(10);
    when(mock.calculate()).thenAnswer(() => ft.calculate());
    expect(mock.myCalc(), 10);
    expect(mock.calculate(), 42);
  });

[TedSander]

Sorry no. Spy used mirrors which can't be used in dart AOT environments such as flutter and soon web. #27

I don't believe this will be possible using our current implementation. It would require a complete rewrite of mockito using codegen which isn't happening anytime soon, and the migration may have other downsides such as slower build/dev cycle times.

For what it's worth in our corpus of code (millions of lines of code) we aren't missing it. It was only used in a couple of places and was easy to migrate.

[fibulwinter]

Essentially a spy is a proxy to real object. It would return mock result if you ask for configured it previously, but for anything else it just forward call to real object. Real object has no access to spy, so it will use real methods for all calls.

In your example ft.calculate() will be delegated to real object (as there is no stubbing for it defined) and real object will use real myCalc().

[zijam]

Thx for the clarification 👍

[EasonPai]

So, without spy how can we do this now?

[EasonPai]

Thanks for the help.

I have thought about thenAnswer,
but it can be tedious when I have to do partial mocking in a big class.

Do we have any plan to add back spy api? or something like thenCallRealMethod()
http://static.javadoc.io/org.mockito/mockito-core/2.15.0/org/mockito/Mockito.html#partial_mocks

[kjawadDeveloper1]

Any update on using Spy methods?

[srawlins]

No; no current plans for supporting spies.