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Regression testing framework for Python 3.4+. It's useful in unit and module testing when creating or rewriting test data is too boring. After you canonized the ideal output result all tests will pass until the data changes moment.

  • Writes data to the local filesystem storage
  • Supports binary, text, json and picklable objects
  • Different policies for resolving test conflicts

Currently integrates best with the PyTest, but other frameworks are also welcomed.


One pytest function is the scope of the result. Newly calculated data compares with the original canonized result.

# regress is the function scope helper fixture easy to setup
def test_simple(regress: RegressFixture):
    result = {'a': 1}
    regress.test(result)  # Commit first time

    result2 = {'a': 1}
    regress.test(result2)  # Ok. No object result changes

    result3 = {'a': 3}  # Try commit change. Raised the AssertionError
    with pytest.raises(AssertionError) as e:

To continue exploring you can visit the quickstart.


pip3 install regress



Making virtualenv with development requirements:

python3 -m venv venv
venv/bin/pip install --upgrade pip
venv/bin/pip install -r requirements.txt


venv/bin/pytest -s tests
venv/bin/flake8 regress --show-source --statistics
venv/bin/pytest --cov=regress --cov-report html

Or for automatizing:

chmod +x

Some tests uses console for user interaction. Add --canonize flag:

venv/bin/pytest -s tests --canonize

Building docs

Using sphinx:

cd docs

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regress-0.0.4.tar.gz (9.1 kB view hashes)

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