pytest-repeat
pytest-repeat is a plugin for pytest that makes it easy to repeat a single test, or multiple tests, a specific number of times.
Requirements
You will need the following prerequisites in order to use pytest-repeat:
- Python 2.7, 3.5+ or PyPy
- pytest 3.6 or newer
Installation
To install pytest-repeat:
$ pip install pytest-repeat
Repeating a test
Use the --count
command line option to specify how many times you want
your test, or tests, to be run:
$ pytest --count=10 test_file.py
Each test collected by pytest will be run count
times.
If you want to mark a test in your code to be repeated a number of times, you
can use the @pytest.mark.repeat(count)
decorator:
import pytest
@pytest.mark.repeat(3)
def test_repeat_decorator():
pass
If you want to override default tests executions order, you can use --repeat-scope
command line option with one of the next values: session
, module
, class
or function
(default).
It behaves like a scope of the pytest fixture.
function
(default) scope repeats each test count
or repeat
times before executing next test.
session
scope repeats whole tests session, i.e. all collected tests executed once, then all such tests executed again and etc.
class
and module
behaves similar session
, but repeating set of tests is a tests from class or module, not all collected tests.
Repeating a test until failure
If you are trying to diagnose an intermittent failure, it can be useful to run the same
test over and over again until it fails. You can use pytest's -x
option in
conjunction with pytest-repeat to force the test runner to stop at the first failure.
For example:
$ pytest --count=1000 -x test_file.py
This will attempt to run test_file.py 1000 times, but will stop as soon as a failure occurs.
UnitTest Style Tests
Unfortunately pytest-repeat is not able to work with unittest.TestCase test classes.
These tests will simply always run once, regardless of --count
, and show a warning.