Pytest Lazy Fixture

0.6.3 · deprecated · verified Sat Apr 11

pytest-lazy-fixture is a plugin for the pytest testing framework that allows users to pass fixtures as values directly within `pytest.mark.parametrize` decorators. This simplifies test parameterization by enabling the reuse of fixtures where direct fixture injection is not typically supported. The current version is 0.6.3, but the library is no longer actively maintained and has known compatibility issues with newer pytest versions.

Warnings

breaking pytest-lazy-fixture is incompatible with pytest versions 8.0.0 and newer. Attempting to use it with these versions will lead to test failures.
Fix: Downgrade pytest to a version below 8.0.0 (e.g., `pytest==7.3.2`) or consider migrating to an actively maintained alternative like `pytest-lazy-fixtures` (note the 's').
deprecated The `pytest-lazy-fixture` library is no longer actively maintained. This means new features, bug fixes, or compatibility updates for newer pytest versions are unlikely.
Fix: It is highly recommended to migrate to `pytest-lazy-fixtures` (note the 's'), which is a community-maintained fork offering similar functionality and active development. Alternatively, consider using `request.getfixturevalue` for basic cases or redesigning tests to avoid this pattern if possible.
gotcha Fixtures used with `lazy_fixture` are resolved during test execution, not at collection time. This means you cannot use `lazy_fixture` to define parameters that are evaluated during the pytest collection phase for certain advanced scenarios.
Fix: Be aware of the execution timing. If you need fixture values to influence test collection or other pre-execution steps, `lazy_fixture` is not the appropriate tool.
breaking Version 0.4.0 introduced a requirement for `pytest >= 3.3.0`. Older pytest versions will not be compatible with `pytest-lazy-fixture` versions 0.4.0 and above.
Fix: Ensure your pytest version is 3.3.0 or higher when using pytest-lazy-fixture >= 0.4.0.

Install

pip install pytest-lazy-fixture Install stable version

Imports

lazy_fixture
```
from pytest_lazyfixture import lazy_fixture
```
This is the primary function used to wrap fixture names for parameterization.

Quickstart

This quickstart demonstrates how to use `lazy_fixture` to pass the return value of `my_fixture` as a parameter to `test_example` using `pytest.mark.parametrize`.

import pytest
from pytest_lazyfixture import lazy_fixture

@pytest.fixture
def my_fixture():
    return 'Hello from fixture!'

@pytest.mark.parametrize('param_arg', [lazy_fixture('my_fixture')])
def test_example(param_arg):
    assert param_arg == 'Hello from fixture!'

# To run this, save as a .py file (e.g., test_lazy.py) and run 'pytest'

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