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Common fixtures for pytest

Project description

pytest-fixtures

Common fixtures for pytest

To use, just install it and pytest will automatically detect and load all fixtures:

pip install pytest-fixtures

To install automatically, add it to your test requirements in tox.ini or setup.py.

No Dependencies

This package does not depend on any other packages and never will. It uses standard libraries or uses run-time imports and therefore it is lightweight to add to any project. As for which external run-time dependency a fixture needs, that is documented here and shouldn’t matter as you would only use the fixtures that your project already has dependencies on.

Standard Fixtures

Fixtures based on standard Python libraries

test_data

To get path, read, and write test data in tests/data folder, use the test_data fixture.

First, setup the path to test data path in tests/conftest.py:

from pathlib import Path
from fixtures import TestData

TestData.BASE_PATH = Path(__file__).parent / 'data'

And then get path to data files in tests/data using test_data fixture:

def test_integration(test_data):
    obj = MyClass(test_data.path('sample.csv'))

To write out test data:

def test_integration(test_data):
    output = run_cli()
    test_data.write('test_integration.output', output)

Then read the test data to assert:

def test_integration(test_data):
    output = run_cli()
    expected_output = test_data.read('test_integration.output')
    assert expected_output == output

Click Fixtures

Fixtures for Click <http://click.pocoo.org/>

cli_runner

To invoke, assert exit, with stdout/stderr outputs on error:

.. code-block:: python
def test_cli(cli_runner):

result = cli_runner.invoke( … ) # Prints out stdout/stderr from result with headings result = cli_runner.invoke_and_assert_exit(0, … ) # Same as above and asserts exit code == 0

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