pytest-cov


Namepytest-cov JSON
Version 2.5.1 PyPI version JSON
download
home_pagehttps://github.com/pytest-dev/pytest-cov
SummaryPytest plugin for measuring coverage.
upload_time2017-05-11 22:07:26
maintainer
docs_urlNone
authorMarc Schlaich
requires_python
licenseMIT
keywords cover coverage pytest py.test distributed parallel
VCS
bugtrack_url
requirements No requirements were recorded.
Travis-CI
coveralls test coverage
            ========
Overview
========

.. start-badges

.. list-table::
    :stub-columns: 1

    * - docs
      - |docs|
    * - tests
      - | |travis| |appveyor| |requires|
    * - package
      - | |version| |wheel| |supported-versions| |supported-implementations|
        | |commits-since|

.. |docs| image:: https://readthedocs.org/projects/pytest-cov/badge/?style=flat
    :target: https://readthedocs.org/projects/pytest-cov
    :alt: Documentation Status

.. |travis| image:: https://travis-ci.org/pytest-dev/pytest-cov.svg?branch=master
    :alt: Travis-CI Build Status
    :target: https://travis-ci.org/pytest-dev/pytest-cov

.. |appveyor| image:: https://ci.appveyor.com/api/projects/status/github/pytest-dev/pytest-cov?branch=master&svg=true
    :alt: AppVeyor Build Status
    :target: https://ci.appveyor.com/project/pytestbot/pytest-cov

.. |requires| image:: https://requires.io/github/pytest-dev/pytest-cov/requirements.svg?branch=master
    :alt: Requirements Status
    :target: https://requires.io/github/pytest-dev/pytest-cov/requirements/?branch=master

.. |version| image:: https://img.shields.io/pypi/v/pytest-cov.svg
    :alt: PyPI Package latest release
    :target: https://pypi.python.org/pypi/pytest-cov

.. |commits-since| image:: https://img.shields.io/github/commits-since/pytest-dev/pytest-cov/v2.5.1.svg
    :alt: Commits since latest release
    :target: https://github.com/pytest-dev/pytest-cov/compare/v2.5.1...master

.. |wheel| image:: https://img.shields.io/pypi/wheel/pytest-cov.svg
    :alt: PyPI Wheel
    :target: https://pypi.python.org/pypi/pytest-cov

.. |supported-versions| image:: https://img.shields.io/pypi/pyversions/pytest-cov.svg
    :alt: Supported versions
    :target: https://pypi.python.org/pypi/pytest-cov

.. |supported-implementations| image:: https://img.shields.io/pypi/implementation/pytest-cov.svg
    :alt: Supported implementations
    :target: https://pypi.python.org/pypi/pytest-cov

.. end-badges

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.

* Free software: MIT license

Installation
============

Install with pip::

    pip install pytest-cov

For distributed testing support install pytest-xdist::

    pip install pytest-xdist

Upgrade
=======

`pytest-cov 2.0` is using a new ``.pth`` file (``pytest-cov.pth``). You may want to manually remove the older
``init_cov_core.pth`` from site-packages as it's not automatically removed.

Uninstallation
==============

Uninstall with pip::

    pip uninstall pytest-cov

Under certain scenarios a stray ``.pth`` file may be left around in site-packages.

* `pytest-cov 2.0` may leave a ``pytest-cov.pth`` if you installed without wheels
  (``easy_install``, ``setup.py install`` etc).
* `pytest-cov 1.8 or older` will leave a ``init_cov_core.pth``.

Usage
=====

Centralised Testing
-------------------

Centralised testing will report on the combined coverage of the main process and all of its
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 its 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 terminal report with skip covered::

    py.test --cov-report term:skip-covered --cov=myproj tests/

    -------------------- coverage: platform linux2, python 2.6.4-final-0 ---------------------
    Name                 Stmts   Miss  Cover
    ----------------------------------------
    myproj/myproj          257     13    94%
    myproj/feature4286      94      7    92%
    ----------------------------------------
    TOTAL                  353     20    94%

    1 files skipped due to complete coverage.

You can use ``skip-covered`` with ``term-missing`` as well. e.g. ``--cov-report term-missing:skip-covered``

These three report options output to files without showing anything on the terminal::

    py.test --cov-report html
            --cov-report xml
            --cov-report annotate
            --cov=myproj tests/

The output location for each of these reports can be specified. The output location for the XML
report is a file. Where as the output location for the HTML and annotated source code reports are
directories::

    py.test --cov-report html:cov_html
            --cov-report xml:cov.xml
            --cov-report annotate:cov_annotate
            --cov=myproj tests/

The final report option can also suppress printing to the terminal::

    py.test --cov-report= --cov=myproj tests/

This mode can be especially useful on continuous integration servers, where a coverage file
is needed for subsequent processing, but no local report needs to be viewed. For example,
tests run on Travis-CI could produce a .coverage file for use with Coveralls.

Coverage Data File
==================

The data file is erased at the beginning of testing to ensure clean data for each test run. If you
need to combine the coverage of several test runs you can use the ``--cov-append`` option to append
this coverage data to coverage data from previous test runs.

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`: https://coverage.readthedocs.io/en/latest/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 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.

Coverage and debuggers
----------------------

When it comes to TDD one obviously would like to debug tests. Debuggers in Python use mostly the sys.settrace function
to gain access to context. Coverage uses the same technique to get access to the lines executed. Coverage does not play
well with other tracers simultaneously running. This manifests itself in behaviour that PyCharm might not hit a
breakpoint no matter what the user does. Since it is common practice to have coverage configuration in the pytest.ini
file and pytest does not support removeopts or similar the `--no-cov` flag can disable coverage completely.

At the reporting part a warning message will show on screen

    Coverage disabled via --no-cov switch!

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.

Changelog
=========

2.5.1 (2017-05-11)
------------------

* Fixed xdist breakage (regression in ``2.5.0``).
  Fixes `#157 <https://github.com/pytest-dev/pytest-cov/issues/157>`_.
* Allow setting custom ``data_file`` name in ``.coveragerc``.
  Fixes `#145 <https://github.com/pytest-dev/pytest-cov/issues/145>`_.
  Contributed by Jannis Leidel & Ionel Cristian Mărieș in
  `#156 <https://github.com/pytest-dev/pytest-cov/pull/156>`_.

2.5.0 (2017-05-09)
------------------

* Always show a summary when ``--cov-fail-under`` is used. Contributed by Francis Niu in `PR#141
  <https://github.com/pytest-dev/pytest-cov/pull/141>`_.
* Added ``--cov-branch`` option. Fixes `#85 <https://github.com/pytest-dev/pytest-cov/issues/85>`_.
* Improve exception handling in subprocess setup. Fixes `#144 <https://github.com/pytest-dev/pytest-cov/issues/144>`_.
* Fixed handling when ``--cov`` is used multiple times. Fixes `#151 <https://github.com/pytest-dev/pytest-cov/issues/151>`_.

2.4.0 (2016-10-10)
------------------

* Added a "disarm" option: ``--no-cov``. It will disable coverage measurements. Contributed by Zoltan Kozma in
  `PR#135 <https://github.com/pytest-dev/pytest-cov/pull/135>`_.

  **WARNING: Do not put this in your configuration files, it's meant to be an one-off for situations where you want to
  disable coverage from command line.**
* Fixed broken exception handling on ``.pth`` file. See `#136 <https://github.com/pytest-dev/pytest-cov/issues/136>`_.

2.3.1 (2016-08-07)
------------------

* Fixed regression causing spurious errors when xdist was used. See `#124
  <https://github.com/pytest-dev/pytest-cov/issues/124>`_.
* Fixed DeprecationWarning about incorrect `addoption` use. Contributed by Florian Bruhin in `PR#127
  <https://github.com/pytest-dev/pytest-cov/pull/127>`_.
* Fixed deprecated use of funcarg fixture API. Contributed by Daniel Hahler in `PR#125
  <https://github.com/pytest-dev/pytest-cov/pull/125>`_.

2.3.0 (2016-07-05)
------------------

* Add support for specifying output location for html, xml, and annotate report.
  Contributed by Patrick Lannigan in `PR#113 <https://github.com/pytest-dev/pytest-cov/pull/113>`_.
* Fix bug hiding test failure when cov-fail-under failed.
* For coverage >= 4.0, match the default behaviour of `coverage report` and
  error if coverage fails to find the source instead of just printing a warning.
  Contributed by David Szotten in `PR#116 <https://github.com/pytest-dev/pytest-cov/pull/116>`_.
* Fixed bug occurred when bare ``--cov`` parameter was used with xdist.
  Contributed by Michael Elovskikh in `PR#120 <https://github.com/pytest-dev/pytest-cov/pull/120>`_.
* Add support for ``skip_covered`` and added ``--cov-report=term-skip-covered`` command
  line options. Contributed by Saurabh Kumar in `PR#115 <https://github.com/pytest-dev/pytest-cov/pull/115>`_.

2.2.1 (2016-01-30)
------------------

* Fixed incorrect merging of coverage data when xdist was used and coverage was ``>= 4.0``.

2.2.0 (2015-10-04)
------------------

* Added support for changing working directory in tests. Previously changing working
  directory would disable coverage measurements in suprocesses.
* Fixed broken handling for ``--cov-report=annotate``.

2.1.0 (2015-08-23)
------------------

* Added support for `coverage 4.0b2`.
* Added the ``--cov-append`` command line options. Contributed by Christian Ledermann
  in `PR#80 <https://github.com/pytest-dev/pytest-cov/pull/80>`_.

2.0.0 (2015-07-28)
------------------

* Added ``--cov-fail-under``, akin to the new ``fail_under`` option in `coverage-4.0`
  (automatically activated if there's a ``[report] fail_under = ...`` in ``.coveragerc``).
* Changed ``--cov-report=term`` to automatically upgrade to ``--cov-report=term-missing``
  if there's ``[run] show_missing = True`` in ``.coveragerc``.
* Changed ``--cov`` so it can be used with no path argument (in wich case the source
  settings from ``.coveragerc`` will be used instead).
* Fixed `.pth` installation to work in all cases (install, easy_install, wheels, develop etc).
* Fixed `.pth` uninstallation to work for wheel installs.
* Support for coverage 4.0.
* Data file suffixing changed to use coverage's ``data_suffix=True`` option (instead of the
  custom suffixing).
* Avoid warning about missing coverage data (just like ``coverage.control.process_startup``).
* Fixed a race condition when running with xdist (all the workers tried to combine the files).
  It's possible that this issue is not present in `pytest-cov 1.8.X`.

1.8.2 (2014-11-06)
------------------

* N/A



            

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    "description": "========\nOverview\n========\n\n.. start-badges\n\n.. list-table::\n    :stub-columns: 1\n\n    * - docs\n      - |docs|\n    * - tests\n      - | |travis| |appveyor| |requires|\n    * - package\n      - | |version| |wheel| |supported-versions| |supported-implementations|\n        | |commits-since|\n\n.. |docs| image:: https://readthedocs.org/projects/pytest-cov/badge/?style=flat\n    :target: https://readthedocs.org/projects/pytest-cov\n    :alt: Documentation Status\n\n.. |travis| image:: https://travis-ci.org/pytest-dev/pytest-cov.svg?branch=master\n    :alt: Travis-CI Build Status\n    :target: https://travis-ci.org/pytest-dev/pytest-cov\n\n.. |appveyor| image:: https://ci.appveyor.com/api/projects/status/github/pytest-dev/pytest-cov?branch=master&svg=true\n    :alt: AppVeyor Build Status\n    :target: https://ci.appveyor.com/project/pytestbot/pytest-cov\n\n.. |requires| image:: https://requires.io/github/pytest-dev/pytest-cov/requirements.svg?branch=master\n    :alt: Requirements Status\n    :target: https://requires.io/github/pytest-dev/pytest-cov/requirements/?branch=master\n\n.. |version| image:: https://img.shields.io/pypi/v/pytest-cov.svg\n    :alt: PyPI Package latest release\n    :target: https://pypi.python.org/pypi/pytest-cov\n\n.. |commits-since| image:: https://img.shields.io/github/commits-since/pytest-dev/pytest-cov/v2.5.1.svg\n    :alt: Commits since latest release\n    :target: https://github.com/pytest-dev/pytest-cov/compare/v2.5.1...master\n\n.. |wheel| image:: https://img.shields.io/pypi/wheel/pytest-cov.svg\n    :alt: PyPI Wheel\n    :target: https://pypi.python.org/pypi/pytest-cov\n\n.. |supported-versions| image:: https://img.shields.io/pypi/pyversions/pytest-cov.svg\n    :alt: Supported versions\n    :target: https://pypi.python.org/pypi/pytest-cov\n\n.. |supported-implementations| image:: https://img.shields.io/pypi/implementation/pytest-cov.svg\n    :alt: Supported implementations\n    :target: https://pypi.python.org/pypi/pytest-cov\n\n.. end-badges\n\nThis plugin produces coverage reports.  It supports centralised testing and distributed testing in\nboth load and each modes.  It also supports coverage of subprocesses.\n\nAll features offered by the coverage package should be available, either through pytest-cov or\nthrough coverage's config file.\n\n* Free software: MIT license\n\nInstallation\n============\n\nInstall with pip::\n\n    pip install pytest-cov\n\nFor distributed testing support install pytest-xdist::\n\n    pip install pytest-xdist\n\nUpgrade\n=======\n\n`pytest-cov 2.0` is using a new ``.pth`` file (``pytest-cov.pth``). You may want to manually remove the older\n``init_cov_core.pth`` from site-packages as it's not automatically removed.\n\nUninstallation\n==============\n\nUninstall with pip::\n\n    pip uninstall pytest-cov\n\nUnder certain scenarios a stray ``.pth`` file may be left around in site-packages.\n\n* `pytest-cov 2.0` may leave a ``pytest-cov.pth`` if you installed without wheels\n  (``easy_install``, ``setup.py install`` etc).\n* `pytest-cov 1.8 or older` will leave a ``init_cov_core.pth``.\n\nUsage\n=====\n\nCentralised Testing\n-------------------\n\nCentralised testing will report on the combined coverage of the main process and all of its\nsubprocesses.\n\nRunning centralised testing::\n\n    py.test --cov=myproj tests/\n\nShows a terminal report::\n\n    -------------------- coverage: platform linux2, python 2.6.4-final-0 ---------------------\n    Name                 Stmts   Miss  Cover\n    ----------------------------------------\n    myproj/__init__          2      0   100%\n    myproj/myproj          257     13    94%\n    myproj/feature4286      94      7    92%\n    ----------------------------------------\n    TOTAL                  353     20    94%\n\n\nDistributed Testing: Load\n-------------------------\n\nDistributed testing with dist mode set to load will report on the combined coverage of all slaves.\nThe slaves may be spread out over any number of hosts and each slave may be located anywhere on the\nfile system.  Each slave will have its subprocesses measured.\n\nRunning distributed testing with dist mode set to load::\n\n    py.test --cov=myproj -n 2 tests/\n\nShows a terminal report::\n\n    -------------------- coverage: platform linux2, python 2.6.4-final-0 ---------------------\n    Name                 Stmts   Miss  Cover\n    ----------------------------------------\n    myproj/__init__          2      0   100%\n    myproj/myproj          257     13    94%\n    myproj/feature4286      94      7    92%\n    ----------------------------------------\n    TOTAL                  353     20    94%\n\n\nAgain but spread over different hosts and different directories::\n\n    py.test --cov=myproj --dist load\n            --tx ssh=memedough@host1//chdir=testenv1\n            --tx ssh=memedough@host2//chdir=/tmp/testenv2//python=/tmp/env1/bin/python\n            --rsyncdir myproj --rsyncdir tests --rsync examples\n            tests/\n\nShows a terminal report::\n\n    -------------------- coverage: platform linux2, python 2.6.4-final-0 ---------------------\n    Name                 Stmts   Miss  Cover\n    ----------------------------------------\n    myproj/__init__          2      0   100%\n    myproj/myproj          257     13    94%\n    myproj/feature4286      94      7    92%\n    ----------------------------------------\n    TOTAL                  353     20    94%\n\n\nDistributed Testing: Each\n-------------------------\n\nDistributed testing with dist mode set to each will report on the combined coverage of all slaves.\nSince each slave is running all tests this allows generating a combined coverage report for multiple\nenvironments.\n\nRunning distributed testing with dist mode set to each::\n\n    py.test --cov=myproj --dist each\n            --tx popen//chdir=/tmp/testenv3//python=/usr/local/python27/bin/python\n            --tx ssh=memedough@host2//chdir=/tmp/testenv4//python=/tmp/env2/bin/python\n            --rsyncdir myproj --rsyncdir tests --rsync examples\n            tests/\n\nShows a terminal report::\n\n    ---------------------------------------- coverage ----------------------------------------\n                              platform linux2, python 2.6.5-final-0\n                              platform linux2, python 2.7.0-final-0\n    Name                 Stmts   Miss  Cover\n    ----------------------------------------\n    myproj/__init__          2      0   100%\n    myproj/myproj          257     13    94%\n    myproj/feature4286      94      7    92%\n    ----------------------------------------\n    TOTAL                  353     20    94%\n\n\nReporting\n=========\n\nIt is possible to generate any combination of the reports for a single test run.\n\nThe available reports are terminal (with or without missing line numbers shown), HTML, XML and\nannotated source code.\n\nThe terminal report without line numbers (default)::\n\n    py.test --cov-report term --cov=myproj tests/\n\n    -------------------- coverage: platform linux2, python 2.6.4-final-0 ---------------------\n    Name                 Stmts   Miss  Cover\n    ----------------------------------------\n    myproj/__init__          2      0   100%\n    myproj/myproj          257     13    94%\n    myproj/feature4286      94      7    92%\n    ----------------------------------------\n    TOTAL                  353     20    94%\n\n\nThe terminal report with line numbers::\n\n    py.test --cov-report term-missing --cov=myproj tests/\n\n    -------------------- coverage: platform linux2, python 2.6.4-final-0 ---------------------\n    Name                 Stmts   Miss  Cover   Missing\n    --------------------------------------------------\n    myproj/__init__          2      0   100%\n    myproj/myproj          257     13    94%   24-26, 99, 149, 233-236, 297-298, 369-370\n    myproj/feature4286      94      7    92%   183-188, 197\n    --------------------------------------------------\n    TOTAL                  353     20    94%\n\nThe terminal report with skip covered::\n\n    py.test --cov-report term:skip-covered --cov=myproj tests/\n\n    -------------------- coverage: platform linux2, python 2.6.4-final-0 ---------------------\n    Name                 Stmts   Miss  Cover\n    ----------------------------------------\n    myproj/myproj          257     13    94%\n    myproj/feature4286      94      7    92%\n    ----------------------------------------\n    TOTAL                  353     20    94%\n\n    1 files skipped due to complete coverage.\n\nYou can use ``skip-covered`` with ``term-missing`` as well. e.g. ``--cov-report term-missing:skip-covered``\n\nThese three report options output to files without showing anything on the terminal::\n\n    py.test --cov-report html\n            --cov-report xml\n            --cov-report annotate\n            --cov=myproj tests/\n\nThe output location for each of these reports can be specified. The output location for the XML\nreport is a file. Where as the output location for the HTML and annotated source code reports are\ndirectories::\n\n    py.test --cov-report html:cov_html\n            --cov-report xml:cov.xml\n            --cov-report annotate:cov_annotate\n            --cov=myproj tests/\n\nThe final report option can also suppress printing to the terminal::\n\n    py.test --cov-report= --cov=myproj tests/\n\nThis mode can be especially useful on continuous integration servers, where a coverage file\nis needed for subsequent processing, but no local report needs to be viewed. For example,\ntests run on Travis-CI could produce a .coverage file for use with Coveralls.\n\nCoverage Data File\n==================\n\nThe data file is erased at the beginning of testing to ensure clean data for each test run. If you\nneed to combine the coverage of several test runs you can use the ``--cov-append`` option to append\nthis coverage data to coverage data from previous test runs.\n\nThe data file is left at the end of testing so that it is possible to use normal coverage tools to\nexamine it.\n\n\nCoverage Config File\n====================\n\nThis plugin provides a clean minimal set of command line options that are added to pytest.  For\nfurther control of coverage use a coverage config file.\n\nFor example if tests are contained within the directory tree being measured the tests may be\nexcluded if desired by using a .coveragerc file with the omit option set::\n\n    py.test --cov-config .coveragerc\n            --cov=myproj\n            myproj/tests/\n\nWhere the .coveragerc file contains file globs::\n\n    [run]\n    omit = tests/*\n\nFor full details refer to the `coverage config file`_ documentation.\n\n.. _`coverage config file`: https://coverage.readthedocs.io/en/latest/config.html\n\nNote that this plugin controls some options and setting the option in the config file will have no\neffect.  These include specifying source to be measured (source option) and all data file handling\n(data_file and parallel options).\n\nLimitations\n===========\n\nFor distributed testing the slaves must have the pytest-cov package installed.  This is needed since\nthe plugin must be registered through setuptools for pytest to start the plugin on the\nslave.\n\nFor subprocess measurement environment variables must make it from the main process to the\nsubprocess.  The python used by the subprocess must have pytest-cov installed.  The subprocess must\ndo normal site initialisation so that the environment variables can be detected and coverage\nstarted.\n\nCoverage and debuggers\n----------------------\n\nWhen it comes to TDD one obviously would like to debug tests. Debuggers in Python use mostly the sys.settrace function\nto gain access to context. Coverage uses the same technique to get access to the lines executed. Coverage does not play\nwell with other tracers simultaneously running. This manifests itself in behaviour that PyCharm might not hit a\nbreakpoint no matter what the user does. Since it is common practice to have coverage configuration in the pytest.ini\nfile and pytest does not support removeopts or similar the `--no-cov` flag can disable coverage completely.\n\nAt the reporting part a warning message will show on screen\n\n    Coverage disabled via --no-cov switch!\n\nAcknowledgements\n================\n\nWhilst this plugin has been built fresh from the ground up it has been influenced by the work done\non pytest-coverage (Ross Lawley, James Mills, Holger Krekel) and nose-cover (Jason Pellerin) which are\nother coverage plugins.\n\nNed Batchelder for coverage and its ability to combine the coverage results of parallel runs.\n\nHolger Krekel for pytest with its distributed testing support.\n\nJason Pellerin for nose.\n\nMichael Foord for unittest2.\n\nNo doubt others have contributed to these tools as well.\n\nChangelog\n=========\n\n2.5.1 (2017-05-11)\n------------------\n\n* Fixed xdist breakage (regression in ``2.5.0``).\n  Fixes `#157 <https://github.com/pytest-dev/pytest-cov/issues/157>`_.\n* Allow setting custom ``data_file`` name in ``.coveragerc``.\n  Fixes `#145 <https://github.com/pytest-dev/pytest-cov/issues/145>`_.\n  Contributed by Jannis Leidel & Ionel Cristian M\u0103rie\u0219 in\n  `#156 <https://github.com/pytest-dev/pytest-cov/pull/156>`_.\n\n2.5.0 (2017-05-09)\n------------------\n\n* Always show a summary when ``--cov-fail-under`` is used. Contributed by Francis Niu in `PR#141\n  <https://github.com/pytest-dev/pytest-cov/pull/141>`_.\n* Added ``--cov-branch`` option. Fixes `#85 <https://github.com/pytest-dev/pytest-cov/issues/85>`_.\n* Improve exception handling in subprocess setup. Fixes `#144 <https://github.com/pytest-dev/pytest-cov/issues/144>`_.\n* Fixed handling when ``--cov`` is used multiple times. Fixes `#151 <https://github.com/pytest-dev/pytest-cov/issues/151>`_.\n\n2.4.0 (2016-10-10)\n------------------\n\n* Added a \"disarm\" option: ``--no-cov``. It will disable coverage measurements. Contributed by Zoltan Kozma in\n  `PR#135 <https://github.com/pytest-dev/pytest-cov/pull/135>`_.\n\n  **WARNING: Do not put this in your configuration files, it's meant to be an one-off for situations where you want to\n  disable coverage from command line.**\n* Fixed broken exception handling on ``.pth`` file. See `#136 <https://github.com/pytest-dev/pytest-cov/issues/136>`_.\n\n2.3.1 (2016-08-07)\n------------------\n\n* Fixed regression causing spurious errors when xdist was used. See `#124\n  <https://github.com/pytest-dev/pytest-cov/issues/124>`_.\n* Fixed DeprecationWarning about incorrect `addoption` use. Contributed by Florian Bruhin in `PR#127\n  <https://github.com/pytest-dev/pytest-cov/pull/127>`_.\n* Fixed deprecated use of funcarg fixture API. Contributed by Daniel Hahler in `PR#125\n  <https://github.com/pytest-dev/pytest-cov/pull/125>`_.\n\n2.3.0 (2016-07-05)\n------------------\n\n* Add support for specifying output location for html, xml, and annotate report.\n  Contributed by Patrick Lannigan in `PR#113 <https://github.com/pytest-dev/pytest-cov/pull/113>`_.\n* Fix bug hiding test failure when cov-fail-under failed.\n* For coverage >= 4.0, match the default behaviour of `coverage report` and\n  error if coverage fails to find the source instead of just printing a warning.\n  Contributed by David Szotten in `PR#116 <https://github.com/pytest-dev/pytest-cov/pull/116>`_.\n* Fixed bug occurred when bare ``--cov`` parameter was used with xdist.\n  Contributed by Michael Elovskikh in `PR#120 <https://github.com/pytest-dev/pytest-cov/pull/120>`_.\n* Add support for ``skip_covered`` and added ``--cov-report=term-skip-covered`` command\n  line options. Contributed by Saurabh Kumar in `PR#115 <https://github.com/pytest-dev/pytest-cov/pull/115>`_.\n\n2.2.1 (2016-01-30)\n------------------\n\n* Fixed incorrect merging of coverage data when xdist was used and coverage was ``>= 4.0``.\n\n2.2.0 (2015-10-04)\n------------------\n\n* Added support for changing working directory in tests. Previously changing working\n  directory would disable coverage measurements in suprocesses.\n* Fixed broken handling for ``--cov-report=annotate``.\n\n2.1.0 (2015-08-23)\n------------------\n\n* Added support for `coverage 4.0b2`.\n* Added the ``--cov-append`` command line options. Contributed by Christian Ledermann\n  in `PR#80 <https://github.com/pytest-dev/pytest-cov/pull/80>`_.\n\n2.0.0 (2015-07-28)\n------------------\n\n* Added ``--cov-fail-under``, akin to the new ``fail_under`` option in `coverage-4.0`\n  (automatically activated if there's a ``[report] fail_under = ...`` in ``.coveragerc``).\n* Changed ``--cov-report=term`` to automatically upgrade to ``--cov-report=term-missing``\n  if there's ``[run] show_missing = True`` in ``.coveragerc``.\n* Changed ``--cov`` so it can be used with no path argument (in wich case the source\n  settings from ``.coveragerc`` will be used instead).\n* Fixed `.pth` installation to work in all cases (install, easy_install, wheels, develop etc).\n* Fixed `.pth` uninstallation to work for wheel installs.\n* Support for coverage 4.0.\n* Data file suffixing changed to use coverage's ``data_suffix=True`` option (instead of the\n  custom suffixing).\n* Avoid warning about missing coverage data (just like ``coverage.control.process_startup``).\n* Fixed a race condition when running with xdist (all the workers tried to combine the files).\n  It's possible that this issue is not present in `pytest-cov 1.8.X`.\n\n1.8.2 (2014-11-06)\n------------------\n\n* N/A\n\n\n", 
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