Show stdout and stderr for linter bears

[AbdealiLoKo]

Print the stdout and stderr from linter based bears when tests fail.

Gets difficult to debug things like: https://ci.appveyor.com/project/coala/coala-bears/build/1.0.1152/job/itn0bcmo387clohn

I can see that the code for the old API is here : https://github.com/coala-analyzer/coala-bears/blob/master/tests/LocalBearTestHelper.py#L27

We need to add appropriate code for the new API too !
It's been immensely helpful for me to debug

[gitmate-bot]

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CC @sils1297, @AbdealiJK

[arafsheikh]

@AbdealiJK Can you please elaborate a little on what has to be done? L29 & L32 in LocalBearTestHelper already handle stderr and stdout.

[Makman2]

This can be easily achieved with mocking process_output that retrieves the output to the test helper and forwards it then for further execution to linter again 👍

[Makman2]

@arafsheikh ping me if you need help with this, overriding process_output is not yet documented for Linter v2 API^^

[Nosferatul]

@arafsheikh ping

[Mixih]

@arafsheikh it seem that you are not working on this currently. I am reassigning the issue because another person has shown interest and I do not see a pr here.