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Issue 14988009: First cut of testing infrastructure for recipes. (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/tools/build
Patch Set: nitfixen Created 7 years, 7 months ago
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1 .. _faq:
2
3 ==================
4 FAQ and other help
5 ==================
6
7 :history: 20090613T141800, brand new docs.
8 :history: 20091005T073900, updated for 3.1.
9 :history: 20091127T201500, updated for 3.2.
10 :history: 20110605T175500, add the announcement mailing list.
11 :history: 20121231T104700, Tweak the py3 text.
12
13
14 Frequently asked questions
15 --------------------------
16
17 **Q: I use nose to run my tests, and its cover plugin doesn't let me create
18 HTML or XML reports. What should I do?**
19
20 First run your tests and collect coverage data with `nose`_ and its plugin.
21 This will write coverage data into a .coverage file. Then run coverage.py from
22 the :ref:`command line <cmd>` to create the reports you need from that data.
23
24 .. _nose: http://somethingaboutorange.com/mrl/projects/nose
25
26
27 **Q: Why do unexecutable lines show up as executed?**
28
29 Usually this is because you've updated your code and run coverage on it
30 again without erasing the old data. Coverage records line numbers executed, so
31 the old data may have recorded a line number which has since moved, causing
32 coverage to claim a line has been executed which cannot be.
33
34 If you are using the ``-x`` command line action, it doesn't erase first by
35 default. Switch to the ``coverage run`` command, or use the ``-e`` switch to
36 erase all data before starting the next run.
37
38
39 **Q: Why do the bodies of functions (or classes) show as executed, but the def
40 lines do not?**
41
42 This happens because coverage is started after the functions are defined. The
43 definition lines are executed without coverage measurement, then coverage is
44 started, then the function is called. This means the body is measured, but
45 the definition of the function itself is not.
46
47 To fix this, start coverage earlier. If you use the :ref:`command line <cmd>`
48 to run your program with coverage, then your entire program will be monitored.
49 If you are using the :ref:`API <api>`, you need to call coverage.start() before
50 importing the modules that define your functions.
51
52
53 **Q: Does coverage.py work on Python 3.x?**
54
55 Yes, Python 3 is fully supported.
56
57
58 **Q: Isn't coverage testing the best thing ever?**
59
60 It's good, but `it isn't perfect`__.
61
62 __ http://nedbatchelder.com/blog/200710/flaws_in_coverage_measurement.html
63
64
65 .. Other resources
66 ---------------
67
68 There are a number of projects that help integrate coverage.py into other
69 systems:
70
71 - `trialcoverage`_ is a plug-in for Twisted trial.
72
73 .. _trialcoverage: http://pypi.python.org/pypi/trialcoverage
74
75 - `pytest-coverage`_
76
77 .. _pytest-coverage: http://pypi.python.org/pypi/pytest-coverage
78
79 - `django-coverage`_ for use with Django.
80
81 .. _django-coverage: http://pypi.python.org/pypi/django-coverage
82
83
84 **Q: Where can I get more help with coverage.py?**
85
86 You can discuss coverage.py or get help using it on the `Testing In Python`_
87 mailing list.
88
89 .. _Testing In Python: http://lists.idyll.org/listinfo/testing-in-python
90
91 Bug reports are gladly accepted at the `Bitbucket issue tracker`_.
92
93 .. _Bitbucket issue tracker: http://bitbucket.org/ned/coveragepy/issues
94
95 Announcements of new coverage.py releases are sent to the
96 `coveragepy-announce`_ mailing list.
97
98 .. _coveragepy-announce: http://groups.google.com/group/coveragepy-announce
99
100 `I can be reached`__ in a number of ways, I'm happy to answer questions about
101 using coverage.py. I'm also available hourly for consultation or custom
102 development.
103
104 __ http://nedbatchelder.com/site/aboutned.html
105
106
107 History
108 -------
109
110 Coverage.py was originally written by `Gareth Rees`_.
111 Since 2004, `Ned Batchelder`_ has extended and maintained it with the help of
112 `many others`_. The :ref:`change history <changes>` has all the details.
113
114 .. _Gareth Rees: http://garethrees.org/
115 .. _Ned Batchelder: http://nedbatchelder.com
116 .. _many others: http://bitbucket.org/ned/coveragepy/src/tip/AUTHORS.txt
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