Installation

pip install pytest-only

Usage

Use it on functions

import pytest

def test_that_will_not_run():
    assert 0

@pytest.mark.only
def test_that_will_run():
    assert 1

$ py.test -v test_example.py

============================= test session starts ==============================
platform linux -- Python 3.6.1, pytest-3.0.7, py-1.4.33, pluggy-0.4.0 -- /tmp/example/bin/python3.6
cachedir: .cache
rootdir: /tmp/example, inifile:
plugins: only-1.0.0
collected 2 items

test_example.py::test_that_will_run PASSED

=========================== 1 passed in 0.00 seconds ===========================

Or use it on classes

import pytest

class TestThatWillNotRun:
    def test_that_will_not_run(self):
        assert 0


@pytest.mark.only
class TestThatWillRun:
    def test_that_will_run(self):
        assert 1

$ py.test -v test_example.py

============================= test session starts ==============================
platform linux -- Python 3.6.1, pytest-3.0.7, py-1.4.33, pluggy-0.4.0 -- /tmp/example/bin/python3.6
cachedir: .cache
rootdir: /tmp/example, inifile:
plugins: only-1.0.0
collected 2 items

test_example.py::TestThatWillRun::test_that_will_run PASSED

=========================== 1 passed in 0.00 seconds ===========================

Or use it on modules

# test_example.py
import pytest

pytestmark = pytest.mark.only

def test_that_will_run():
    assert 1

# test_example2.py
def test_that_will_not_run():
    assert 0

$ py.test -v test_example.py test_example2.py

============================= test session starts ==============================
platform linux -- Python 3.6.1, pytest-3.0.7, py-1.4.33, pluggy-0.4.0 -- /home/they4kman/.virtualenvs/tmp-53d5944c7c78d28/bin/python3.6
cachedir: .cache
rootdir: /home/they4kman/.virtualenvs/tmp-53d5944c7c78d28, inifile:
plugins: only-1.0.0
collected 2 items

test_example.py::test_that_will_run PASSED

=========================== 1 passed in 0.00 seconds ===========================

Disable for single test run

To run all the tests, regardless of whether @pytest.mark.only is used, pass the --no-only flag to pytest:

$ py.test --no-only

If --no-only has already been passed (perhaps by way of addopts in pytest.ini), use the --only flag to re-enable it:

$ py.test --no-only --only

Pylint checker

If you use pylint, you can avoid committing stray only marks with the bundled plugin. Just enable the pylint checker in your plugins and enable the unexpected-focused rule.

[MASTER]
load-plugins=pytest_only.ext.pylint

[MESSAGES CONTROL]
enable=unexpected-focused

$ cat test_ninja.py
import pytest

@pytest.mark.only
def test_ninja():
    pass

$ pylint test_ninja.py
************* Module mymain
test_ninja.py:3:0: W1650: Unexpected focused test(s) using pytest.mark.only: def test_ninja (unexpected-focused)

Development

1. Install the test/dev requirements using Poetry

   poetry install

2. Run the tests

   py.test

3. Run the tests on all currently-supported platforms

   tox