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Name: pytest-cov
Version: 1.8.0
Summary: py.test plugin for coverage reporting with support for both centralised and distributed testing, including subprocesses and multiprocessing
Home-page: https://github.com/schlamar/pytest-cov
Author: Marc Schlaich
Author-email: marc.schlaich@gmail.com
License: MIT License
Description: pytest-cov
==========
.. image:: https://travis-ci.org/schlamar/pytest-cov.svg?branch=master
:target: https://travis-ci.org/schlamar/pytest-cov
:alt: Build status
.. image:: https://pypip.in/download/pytest-cov/badge.png
:target: https://pypi.python.org/pypi//pytest-cov/
:alt: Downloads
.. image:: https://pypip.in/version/pytest-cov/badge.png
:target: https://pypi.python.org/pypi/pytest-cov/
:alt: Latest Version
.. image:: https://pypip.in/license/pytest-cov/badge.png
:target: https://pypi.python.org/pypi/pytest-cov/
:alt: License
This plugin produces coverage reports. It supports centralised testing and distributed testing in
both load and each modes. It also supports coverage of subprocesses.
All features offered by the coverage package should be available, either through pytest-cov or
through coverage's config file.
Installation
------------
Install with pip::
pip install pytest-cov
For distributed testing support install pytest-xdist::
pip install pytest-xdist
.. NOTE::
Ensure you use pip instead of easy_install as the latter does not correctly install the
init_cov_core.pth file needed for subprocess measurement.
Uninstallation
--------------
Uninstall with pip::
pip uninstall pytest-cov
pip uninstall cov-core
.. NOTE::
Ensure that you manually delete the init_cov_core.pth file in your site-packages directory.
This file starts coverage collection of subprocesses if appropriate during site initialisation
at python startup.
Usage
-----
Centralised Testing
~~~~~~~~~~~~~~~~~~~
Centralised testing will report on the combined coverage of the main process and all of it's
subprocesses.
Running centralised testing::
py.test --cov myproj tests/
Shows a terminal report::
-------------------- coverage: platform linux2, python 2.6.4-final-0 ---------------------
Name Stmts Miss Cover
----------------------------------------
myproj/__init__ 2 0 100%
myproj/myproj 257 13 94%
myproj/feature4286 94 7 92%
----------------------------------------
TOTAL 353 20 94%
Distributed Testing: Load
~~~~~~~~~~~~~~~~~~~~~~~~~
Distributed testing with dist mode set to load will report on the combined coverage of all slaves.
The slaves may be spread out over any number of hosts and each slave may be located anywhere on the
file system. Each slave will have it's subprocesses measured.
Running distributed testing with dist mode set to load::
py.test --cov myproj -n 2 tests/
Shows a terminal report::
-------------------- coverage: platform linux2, python 2.6.4-final-0 ---------------------
Name Stmts Miss Cover
----------------------------------------
myproj/__init__ 2 0 100%
myproj/myproj 257 13 94%
myproj/feature4286 94 7 92%
----------------------------------------
TOTAL 353 20 94%
Again but spread over different hosts and different directories::
py.test --cov myproj --dist load
--tx ssh=memedough@host1//chdir=testenv1
--tx ssh=memedough@host2//chdir=/tmp/testenv2//python=/tmp/env1/bin/python
--rsyncdir myproj --rsyncdir tests --rsync examples
tests/
Shows a terminal report::
-------------------- coverage: platform linux2, python 2.6.4-final-0 ---------------------
Name Stmts Miss Cover
----------------------------------------
myproj/__init__ 2 0 100%
myproj/myproj 257 13 94%
myproj/feature4286 94 7 92%
----------------------------------------
TOTAL 353 20 94%
Distributed Testing: Each
~~~~~~~~~~~~~~~~~~~~~~~~~
Distributed testing with dist mode set to each will report on the combined coverage of all slaves.
Since each slave is running all tests this allows generating a combined coverage report for multiple
environments.
Running distributed testing with dist mode set to each::
py.test --cov myproj --dist each
--tx popen//chdir=/tmp/testenv3//python=/usr/local/python27/bin/python
--tx ssh=memedough@host2//chdir=/tmp/testenv4//python=/tmp/env2/bin/python
--rsyncdir myproj --rsyncdir tests --rsync examples
tests/
Shows a terminal report::
---------------------------------------- coverage ----------------------------------------
platform linux2, python 2.6.5-final-0
platform linux2, python 2.7.0-final-0
Name Stmts Miss Cover
----------------------------------------
myproj/__init__ 2 0 100%
myproj/myproj 257 13 94%
myproj/feature4286 94 7 92%
----------------------------------------
TOTAL 353 20 94%
Reporting
---------
It is possible to generate any combination of the reports for a single test run.
The available reports are terminal (with or without missing line numbers shown), HTML, XML and
annotated source code.
The terminal report without line numbers (default)::
py.test --cov-report term --cov myproj tests/
-------------------- coverage: platform linux2, python 2.6.4-final-0 ---------------------
Name Stmts Miss Cover
----------------------------------------
myproj/__init__ 2 0 100%
myproj/myproj 257 13 94%
myproj/feature4286 94 7 92%
----------------------------------------
TOTAL 353 20 94%
The terminal report with line numbers::
py.test --cov-report term-missing --cov myproj tests/
-------------------- coverage: platform linux2, python 2.6.4-final-0 ---------------------
Name Stmts Miss Cover Missing
--------------------------------------------------
myproj/__init__ 2 0 100%
myproj/myproj 257 13 94% 24-26, 99, 149, 233-236, 297-298, 369-370
myproj/feature4286 94 7 92% 183-188, 197
--------------------------------------------------
TOTAL 353 20 94%
The remaining three reports output to files without showing anything on the terminal (useful for
when the output is going to a continuous integration server)::
py.test --cov-report html
--cov-report xml
--cov-report annotate
--cov myproj tests/
Coverage Data File
------------------
The data file is erased at the beginning of testing to ensure clean data for each test run.
The data file is left at the end of testing so that it is possible to use normal coverage tools to
examine it.
Coverage Config File
--------------------
This plugin provides a clean minimal set of command line options that are added to pytest. For
further control of coverage use a coverage config file.
For example if tests are contained within the directory tree being measured the tests may be
excluded if desired by using a .coveragerc file with the omit option set::
py.test --cov-config .coveragerc
--cov myproj
myproj/tests/
Where the .coveragerc file contains file globs::
[run]
omit = tests/*
For full details refer to the `coverage config file`_ documentation.
.. _`coverage config file`: http://nedbatchelder.com/code/coverage/config.html
Note that this plugin controls some options and setting the option in the config file will have no
effect. These include specifying source to be measured (source option) and all data file handling
(data_file and parallel options).
Limitations
-----------
For distributed testing the slaves must have the pytest-cov package installed. This is needed since
the plugin must be registered through setuptools / distribute for pytest to start the plugin on the
slave.
For subprocess measurement environment variables must make it from the main process to the
subprocess. The python used by the subprocess must have pytest-cov installed. The subprocess must
do normal site initialisation so that the environment variables can be detected and coverage
started.
Acknowledgements
----------------
Whilst this plugin has been built fresh from the ground up it has been influenced by the work done
on pytest-coverage (Ross Lawley, James Mills, Holger Krekel) and nose-cover (Jason Pellerin) which are
other coverage plugins.
Ned Batchelder for coverage and its ability to combine the coverage results of parallel runs.
Holger Krekel for pytest with its distributed testing support.
Jason Pellerin for nose.
Michael Foord for unittest2.
No doubt others have contributed to these tools as well.
Keywords: py.test pytest cover coverage distributed parallel
Platform: UNKNOWN
Classifier: Development Status :: 4 - Beta
Classifier: Intended Audience :: Developers
Classifier: License :: OSI Approved :: MIT License
Classifier: Operating System :: OS Independent
Classifier: Programming Language :: Python
Classifier: Programming Language :: Python :: 2.4
Classifier: Programming Language :: Python :: 2.5
Classifier: Programming Language :: Python :: 2.6
Classifier: Programming Language :: Python :: 2.7
Classifier: Programming Language :: Python :: 3.0
Classifier: Programming Language :: Python :: 3.1
Classifier: Topic :: Software Development :: Testing
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