[TIP] impossible coverage results - django, django-nose, nose-cov, coverage
ned at nedbatchelder.com
Mon Jan 18 18:32:51 PST 2016
On 1/18/16 2:28 PM, Chris Withers wrote:
> Hi Ned,
> After some changes to unwind some knotty import loops in a big Django
> project, we're now seeing coverage report seemingly impossible
> results: looking at one module, I see coverage has dropped from 80+%
> to 27%, with the lines-no-longer-covered being those that would have
> had to execute during import time.
A common problem with the django-nose-cov plugin ecosystem is that
coverage doesn't start until after many modules are already imported. I
usually recommend that coverage run the test runner, instead of the
other way around. This ensures that coverage measures everything.
> Have you ever seen behaviour like this? If so, what should we look out
> Sadly, the stack is not a simple one:
> Django's test runner with the latest version of the django-nose
> plugin, version 1.6 of the nose-cov plugin, 1.15.0 of cov-core and
> 4.0.3 of coverage itself.
If the coverage-runs-the-test-runner idea doesn't fix it, send me the
details of how to run the stack. Usually it isn't a problem to get
> Any help gratefully received!
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