Hi Steve,

I have a regression since the commit d0f49d2f5085ca68e3dc8725f1fb1c9674bfb5ed,

commit d0f49d2f5085ca68e3dc8725f1fb1c9674bfb5ed (HEAD)
Author: Steve Dower <steve.dower@microsoft.com>
Date:   Tue Sep 18 09:10:26 2018 -0700

    bpo-34582: Adds JUnit XML output for regression tests (GH-9210)


Before, I could use pdb for the debugging or just use the print() function for debugging.

Now, this is just impossible, because stdout & stderr are mapped to an other destination.

For the test, just add `import pdb; pdb.set_trace()` in a test and try to execute it.

Thank you

More generally, previously it was possible to add print("HERE") in tests. I use that often do debug tests. Now, the output is hidden, I don't understand the rationale for hiding the output.

Thanks for spotting this!

There's no "rationale" for hiding the output - what happened is I streamlined the test suite to always capture output, instead of some tests deciding whether they ought to capture it or not (and some doing incredibly weird things when capturing, and others capturing the capture).

While I was testing I went immediately to `print(file=sys.__stderr__)`, since that's what I normally do, but it shouldn't be too hard to make the test suite only capture output when collecting it for the test results.

I'll try and get to it in the next two weeks, depending on how my conference schedules work out. I'm also happy to review someone else's change.

Pablo,

I have tested your PR and I get the prompt of pdb only if I use -v on the command line.

For the print() function, I understand but for the pdb.set_trace() function, normally we should have the prompt even we don't specify the --verbose flat.

Do you confirm?

New changeset 02277482ea765335e497ecd9661d4bde9b5ddc67 by Pablo Galindo in branch 'master':
bpo-34945: Buffer output in test suite only when creating junit file (GH-10204)
https://github.com/python/cpython/commit/02277482ea765335e497ecd9661d4bde9b5ddc67

This should be fixed (it works now with and without -v). :)

At least Python 3.6 and 3.7 branches are affected as well, so I reopen the issue.

New changeset 58f7bf3a892031616a6b06ef4b8d36e2ebec172b by Miss Islington (bot) in branch '3.7':
bpo-34945: Buffer output in test suite only when creating junit file (GH-10204)
https://github.com/python/cpython/commit/58f7bf3a892031616a6b06ef4b8d36e2ebec172b

New changeset 7b689c68ab3236455f7d58954435d029e2bb2c8a by Miss Islington (bot) in branch '3.6':
bpo-34945: Buffer output in test suite only when creating junit file (GH-10204)
https://github.com/python/cpython/commit/7b689c68ab3236455f7d58954435d029e2bb2c8a

3.6 and 3.7 are backported!