https://github.com/abalkin/pytest-leaks

A pytest plugin to trace resource leaks.
https://github.com/abalkin/pytest-leaks

leaks-test pytest-plugin trace-resource-leaks

Last synced: about 1 month ago
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A pytest plugin to trace resource leaks.

• Host: GitHub
• URL: https://github.com/abalkin/pytest-leaks
• Owner: abalkin
• License: other
• Created: 2016-11-10T01:59:19.000Z (about 8 years ago)
• Default Branch: master
• Last Pushed: 2019-11-27T18:02:00.000Z (about 5 years ago)
• Last Synced: 2024-09-19T14:47:42.027Z (3 months ago)
• Topics: leaks-test, pytest-plugin, trace-resource-leaks
• Language: Python
• Homepage: https://abalkin.github.io/pytest-leaks
• Size: 596 KB
• Stars: 115
• Watchers: 4
• Forks: 4
• Open Issues: 11
• Metadata Files:
  • Readme: README.md
  • Changelog: CHANGES.md
  • License: LICENSE

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README

        
# pytest-leaks - A pytest plugin to trace resource leaks

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A pytest plugin to trace resource leaks.

## Usage

    leaks:

      -R LEAKS, --leaks=LEAKS

                            runs each test several times and examines

                            sys.gettotalrefcount() to see if the test appears to

                            be leaking references. The argument should be of the

                            form stab:run where 'stab' is the number of times the

                            test is run to let gettotalrefcount settle down, 'run'

                            is the number of times further it is run. These

                            parameters all have defaults (5 and 4, respectively),

                            and the minimal invocation is '-R :'.

To add a leaks test to your py.test session, add the `-R` option on the

command line:

    $ python3-debug -mpytest -v -R : examples/test_faucet.py

    =========================== test session starts ===========================

    platform linux -- Python 3.7.5, pytest-5.3.1, py-1.8.0, pluggy-0.13.1 -- .

    cachedir: .pytest_cache

    rootdir: .

    plugins: leaks-0.3.1

    collected 4 items

    examples/test_faucet.py::test_leaky_faucet LEAKED                   [ 25%]

    examples/test_faucet.py::test_broken_faucet FAILED                  [ 50%]

    examples/test_faucet.py::test_mended_faucet PASSED                  [ 75%]

    examples/test_faucet.py::test_skip_marker_example LEAKED            [100%]

    ================================ FAILURES =================================

    ___________________________ test_broken_faucet ____________________________

        def test_broken_faucet():

    >       assert 0

    E       assert 0

    examples/test_faucet.py:8: AssertionError

    ============================== leaks summary ==============================

    examples/test_faucet.py::test_leaky_faucet: leaked references: [2, 2, 2, 2], memory blocks: [2, 2, 2, 2]

    examples/test_faucet.py::test_skip_marker_example: leaked (not checked): 'not testing'

    ================== 1 failed, 1 passed, 2 leaked in 0.50s ==================

Note that a debug build of Python must be used.  The test file used

above contains the following code:

    $ cat test_faucet.py

    import pytest

    drops = []

    def test_leaky_faucet():

        drops.append({})

    

    def test_broken_faucet():

        assert 0

    

    def test_mended_faucet():

        assert 1

    @pytest.mark.no_leak_check(fail=True, reason="not testing")

    def test_skip_marker_example():

        pass

Note that pytest-leaks runs tests several times: if you see test failures

that are present only when using pytest-leaks, check that the test does

not modify any global state in a way that prevents it from running a

second time.

## Features

- Detects memory leaks by running py.test tests repeatedly and

  comparing total reference counts between the runs.

## Requirements

- py.test version \>= 3;

- A debug build of Python (2.7 or \>=3.5).

On Linux, Python debug builds can be found in packages `pythonX.Y-dbg`

(Debian and derivatives) and `python3-debug` (Fedora and derivatives).

## Installation

You can install "pytest-leaks" via [pip](https://pypi.python.org/pypi/pip/) from

[PyPI](https://pypi.python.org/pypi):

    $ pip install pytest-leaks

## Contributing

Contributions are very welcome. Tests can be run with

[tox](https://tox.readthedocs.io/en/latest/), please ensure the coverage

at least stays the same before you submit a pull request.

## License

Distributed under the terms of the [MIT](http://opensource.org/licenses/MIT) and

[PSF](https://docs.python.org/3/license.html) licenses, "pytest-leaks"

is free and open source software.

## Issues

If you encounter any problems, please [file an issue](https://github.com/abalkin/pytest-leaks/issues)

along with a detailed description.