pytest-cov makes test fail by putting a temporary file into cwd

[ThomasWaldmann]

i have tests that check if some specific files have been extracted into cwd.
they fail when using pytest-cov because some .coverage* file gets created there.

is there any way to avoid this?

[ionelmc]

Have you tried to set something like this in .coveragerc?

[run]
data_file = /tmp/.coverage

[ThomasWaldmann]

Thanks for the pointer, I tried it:

Still getting this failing test:

AssertionError: Lists differ: ['.coverage.testing-worker-lin... != ['file2']

Hmm, maybe this is not a temporary file of coverage, but a lock/pid file of pytest-cov?

[ionelmc]

Strange. Are you using xdist? That file name appears to be suffixed from here

[ThomasWaldmann]

Well, not by myself / not knowingly, but the tests run on travis-ci.org and they somehow have 1 worker per test environment.

[ionelmc]

Can you post a link to the build?

On Saturday, August 8, 2015, TW [email protected] wrote:

Well, not by myself / not knowingly, but the tests run on travis-ci.org
and they somehow have 1 worker per test environment.

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#77 (comment)
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Thanks,
-- Ionel Cristian Mărieș, http://blog.ionelmc.ro

[ThomasWaldmann]

https://travis-ci.org/borgbackup/borg/builds/74694517

[ThomasWaldmann]

https://travis-ci.org/borgbackup/borg/builds/74696354 < hah! was just some vague feeling, that I maybe should try <2.0.0 - and it works now! :)

[ionelmc]

Having a hard time figuring out how the reproduce your issue. IOW, data_file works as expected for me (going to add a test for this soon).

Do you do anything special for coverage configuration (besides having a .coveragerc)?

[ThomasWaldmann]

Well, the test fail issue just went away as soon as I put <2.0.0 in my requirements file.
So it seems it is not creating this file there any more.
I tried with data_file before, but somehow I couldn't solve with that. Part of the issue is that maybe codecov expects the result file to be .coverage in the toplevel dir of the project.

[ionelmc]

I've managed to get your project to work as expected, see:
https://travis-ci.org/ionelmc/borg/jobs/74795190

Diff: borgbackup/borg@master...ionelmc:master

The esential parts:

• data_file and perhaps parallel(not sure if parallel changes anything
  but you should have it anyway)
• --cov-config because you seems to do weird stuff in your tests wrt the
  current directory and that gets pytest-cov confused

I think the real bug here is that pytest-cov forgets about the .coveragerc
if you change the cwd. I'll investigate more later, but you have a solution
above right now :-)

Thanks,
-- Ionel Cristian Mărieș, http://blog.ionelmc.ro

On Sun, Aug 9, 2015 at 1:22 PM, TW [email protected] wrote:

Well, the test fail issue just went away as soon as I put <2.0.0 in my
requirements file.
So it seems it is not creating this file there any more.
I tried with data_file before, but somehow I couldn't solve with that.
Part of the issue is that maybe codecov expects the result file to be
.coverage in the toplevel dir of the project.

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#77 (comment)
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[ionelmc]

The cwd change issue is getting fixed in #95 if you wanna give it a try.