Feature Request: --capture=hide to hide stdout/stderr from the terminal

[matthiasha]

This code mimics Python code with lots of stdout output:

def test_test():
    print 'bla bla bla\n' * 10
    assert False, 'something failed'

Running pytest with --tb=short, I get the following output:

================= test session starts ==================
platform linux2 -- Python 2.7.9 -- py-1.4.31 -- pytest-2.6.4
plugins: 
collected 1 items

test_test.py F

======================= FAILURES =======================
______________________ test_test _______________________
test_test.py:5: in test_test
    assert False, 'something failed'
E   AssertionError: something failed
E   assert False
----------------- Captured stdout call -----------------
bla bla bla
bla bla bla
bla bla bla
bla bla bla
bla bla bla
bla bla bla
bla bla bla
bla bla bla
bla bla bla
bla bla bla

=============== 1 failed in 0.02 seconds ===============

It would be helpful if I could disable the sections "captured stdout/err call", e.g. with --capture=hide, especially as our code prints hundreds of lines usually. The additional information that --tb=short gives over --tb=line however is very useful for understanding where problems come from.

[The-Compiler]

FWIW, I think this sounds really useful. I often did some change which caused a lot of tests (which also print hundreds of lines each) to fail, and hiding the captured output would've given me a nicer overview of what could be going wrong.

[nicoddemus]

I agree it might be useful.

Currently though capture actually configures which capture method to use: no capture, file descriptor or sys. We probably should separate "capture method" from "how to display captured output" options, so I suggest we use another option for that. Also, I imagine we could also have the option of redirecting captured output to a file in addition to showing/hiding it.

[odarbelaeze]

It might be super useful for me, we test an application with lots of logging and it gets super tiring to find the test traceback under the captured stdout/stderr outputs.

[gwax]

In my ideal, there'd be an equivalent to --tb=no for captured output; something like --stdout=no

[feuillemorte]

Please, review:
#3176