Invoke py.test as distutils command with dependency resolution
Project description
Setup scripts can use pytest-runner to add setup.py test support for pytest runner.
License is indicated in the project metadata (typically one or more of the Trove classifiers). For more details, see this explanation.
Usage
Add ‘pytest-runner’ to your ‘setup_requires’. Pin to ‘>=2.0,<3dev’ (or similar) to avoid pulling in incompatible versions.
Include ‘pytest’ and any other testing requirements to ‘tests_require’.
Invoke tests with setup.py pytest.
Pass --index-url to have test requirements downloaded from an alternate index URL (unnecessary if specified for easy_install in setup.cfg).
Pass additional py.test command-line options using --addopts.
Set permanent options for the pytest distutils command in the [pytest] section of setup.cfg.
Set permanent options for the pytest run itself in the [pytest] section of pytest.ini or tox.ini. See pytest 567 for details on why setup.cfg is inadequate.
Optionally, set test=pytest in the [aliases] section of setup.cfg to cause setup.py test to invoke pytest.
Example
The most simple usage looks like this in setup.py:
setup(
setup_requires=[
'pytest-runner',
],
tests_require=[
'pytest',
],
)
Additional dependencies require to run the tests (e.g. mock or pytest plugins) may be added to tests_require and will be downloaded and required by the session before invoking pytest.
See the jaraco.collections project for real-world usage.
Standalone Example
This technique is deprecated - if you have standalone scripts you wish to invoke with dependencies, use rwt.
Although pytest-runner is typically used to add pytest test runner support to maintained packages, pytest-runner may also be used to create standalone tests. Consider this example failure, reported in jsonpickle #117 or this MongoDB test demonstrating a technique that works even when dependencies are required in the test.
Either example file may be cloned or downloaded and simply run on any system with Python and Setuptools. It will download the specified dependencies and run the tests. Afterward, the the cloned directory can be removed and with it all trace of invoking the test. No other dependencies are needed and no system configuration is altered.
Then, anyone trying to replicate the failure can do so easily and with all the power of pytest (rewritten assertions, rich comparisons, interactive debugging, extensibility through plugins, etc).
As a result, the communication barrier for describing and replicating failures is made almost trivially low.
Considerations
Conditional Requirement
Because it uses Setuptools setup_requires, pytest-runner will install itself on every invocation of setup.py. In some cases, this causes delays for invocations of setup.py that will never invoke pytest-runner. To help avoid this contingency, consider requiring pytest-runner only when pytest is invoked:
needs_pytest = {'pytest', 'test', 'ptr'}.intersection(sys.argv)
pytest_runner = ['pytest-runner'] if needs_pytest else []
# ...
setup(
#...
setup_requires=[
#... (other setup requirements)
] + pytest_runner,
)
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