[TIP] coverage.py: Unexpected coverage report for library modules

[Alfredo Deza]

On Mon, Oct 25, 2010 at 9:43 PM, Win Treese <treese at acm.org> wrote:

>
> I can't figure out why I'm getting coverage reports for standard library
> modules with the (most excellent) coverage.py and (also most excellent)
> nose:
>
> Python source:
>
> % cat test.py
> """Demonstrate coverage of library module."""
>
> import json
>
> def test_json():
>   print json.dumps({'a':3})
>
>
> Run nose with coverage:
>
> % nosetests --with-cover
>
> You are missing the "--cover-package" flag that specifies what package to
track.

This is very useful because sometimes you need a report on a sub-package:

nosetests --with-cover --cover-package=foo.sub_foo

If you do not provide that flag, you are telling the tool to track coverage
in everything that is touched by your
execution.



> .
> Name                  Stmts   Miss  Cover   Missing
> ---------------------------------------------------
> encodings.hex_codec      28     28     0%   9-71
> json                     39     39     0%   100-323
> json.decoder            216    216     0%   3-365
> json.encoder            241    241     0%   3-442
> json.scanner             52     52     0%   3-67
> ---------------------------------------------------
> TOTAL                   576    576     0%
> ----------------------------------------------------------------------
> Ran 1 test in 0.012s
>
> This is on Mac OS X 10.6.4 with:
>
> $ python --version
> Python 2.7
> $ nosetests --version
> nosetests version 0.11.4
> $ coverage --version
> Coverage.py, version 3.4.  http://nedbatchelder.com/code/coverage
>
> From the documentation, I would expect those modules to be omitted. The
> coverage information is also incorrect, as if they are being reported, but
> not actually processed. I tried to trace it down through the code, but
> couldn't find the problem quickly.
>
> Thanks for any help,
>
> Win Treese
> treese at acm.org
>
>
>
>
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