Support @Captor injection in JUnit 5 method parameters

[filiphr]

There is already an open PR #1350 that proposes and adds support for @Mock. This issue is to extend on that PR if / when it gets merged to also support the @Captor annotation in method parameters. This would allow to inject method specific generic ArgumentCaptor that can't be caught with ArgumentCaptor.of(Class).

[schrieveslaach]

Is there any update on this issue?

It would be very handy to write following with Junit 5:

@Test
void test( @Mock ClassToMock mock, @Captor ArgumentCaptor<String> argument )
{
   verify( mock ).doStuff( argument.capture() );
}

Unfortunately, this does not work because @Captor is still not applicable to a parameter.

[TimvdLippe]

Feel free to open a PR to implement this feature.

[TimvdLippe]

Also please note this prior discussion on this feature which ideally requires some fixes in JUnit5: junit-team/junit5#1604

[EugenLaz]

Hi @TimvdLippe.
I see that the discussion related to the JUni5 task was marked as closed due to inactivity and there are no planned changes for having an in-built solution.
Is implementing a custom resolver similar to the one proposed by nsmolenskii will be ok?
If so I'll be glad to create a PR 🙂

[TimvdLippe]

Yes that is okay. Feel free to send us a PR!