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

[Ned Batchelder]

Win,

Can you show the output of "coverage debug sys"?  You may have a 
configuration I didn't take into account.

--Ned.

PS: Hello from the Digital days!

On 10/26/2010 1:43 PM, Win Treese wrote:
> On Oct 26, 2010, at 7:56 AM, Alfredo Deza wrote:
>
>>
>> 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.
> Thanks for the quick note.
>
> That would make sense, except that the coverage.py documentation at
> 	http://nedbatchelder.com/code/coverage/source.html
> says that
> 	"When running your code, the coverage run command will by default measure all code, unless it is part of the Python standard library.".
> and the json library is part of the Python standard library.
>
> Thanks,
>
> Win
>
>>
>> .
>> 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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>
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