pytest plugin to re-run tests to eliminate flaky failures
pytest-rerunfailures is a plugin for py.test that re-runs tests to eliminate intermittent failures.
You will need the following prerequisites in order to use pytest-rerunfailures:
- Python 2.7, 3.4, 3.5, 3.6, PyPy, or PyPy3
- pytest 2.8.7 or newer
To install pytest-rerunfailures:
$ pip install pytest-rerunfailures
Re-run all failures
To re-run all test failures, use the --reruns command line option with the maximum number of times you’d like the tests to run:
$ pytest --reruns 5
To add a delay time between re-runs use the --reruns-delay command line option with the amount of seconds that you would like wait before the next test re-run is launched:
$ pytest --reruns 5 --reruns-delay 1
Re-run individual failures
To mark individual tests as flaky, and have them automatically re-run when they fail, add the flaky mark with the maximum number of times you’d like the test to run:
@pytest.mark.flaky(reruns=5) def test_example(): import random assert random.choice([True, False])
Note that when teardown fails, two reports are generated for the case, one for the test case and the other for the teardown error.
You can also specify the re-run delay time in the marker:
@pytest.mark.flaky(reruns=5, reruns_delay=2) def test_example(): import random assert random.choice([True, False])
Here’s an example of the output provided by the plugin when run with --reruns 2 and -r aR:
test_report.py RRF ================================== FAILURES ================================== __________________________________ test_fail _________________________________ def test_fail(): > assert False E assert False test_report.py:9: AssertionError ============================ rerun test summary info ========================= RERUN test_report.py::test_fail RERUN test_report.py::test_fail ============================ short test summary info ========================= FAIL test_report.py::test_fail ======================= 1 failed, 2 rerun in 0.02 seconds ====================
Note that output will show all re-runs. Tests that fail on all the re-runs will be marked as failed.
- This plugin may not be used with class, module, and package level fixtures.
- This plugin is not compatible with pytest-xdist’s –looponfail flag.
- This plugin is not compatible with the core –pdb flag.
- Added option to add a delay time between test re-runs (Thanks to @Kanguros for the PR).
- Added support for pytest >= 3.3.
- Drop support for pytest < 2.8.7.
- Restored compatibility with pytest-xdist. (Thanks to @davehunt for the PR)
- Add support for Python 3.6.
- Add support for pytest 2.9 up to 3.2
- Drop support for Python 2.6 and 3.3.
- Drop support for pytest < 2.7.
- Ensure that other plugins can run after this one, in case of a global setting --rerun=0. (Thanks to @sublee for the PR)
- Add default value of reruns=1 if pytest.mark.flaky() is called without arguments.
- Also offer a distribution as universal wheel. (Thanks to @tltx for the PR)
- Prepare CLI options to pytest 3.0, to avoid a deprecation warning.
- Fix error due to missing CHANGES.rst when creating the source distribution by adding a MANIFEST.in.
- Drop support for Python 3.2, since supporting it became too much of a hassle. (Reason: Virtualenv 14+ / PIP 8+ do not support Python 3.2 anymore.)
- Add support for –resultlog option by parsing reruns accordingly. (#28)
- Improve package description and include CHANGELOG into description.
- Rewrite to use newer API of pytest >= 2.3.0
- Improve support for pytest-xdist by only logging the final result. (Logging intermediate results will finish the test rather rerunning it.)
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