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easy assertion with expected results saved to yaml files

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Easy assertion with expected results saved to yaml files.


  • Creates yaml files for expected test results , a.k.a. tape.

  • Creates separate tape for each test file. Each tape stores results for all tests that have utilised tape fixture.

  • supports parametrized tests, as long as all parameters can be jsonified.

  • Hash functions are used to store and identify params.

  • Expected results are stored as dictionaries in yaml, so that they can be compared using tolerances.


  • python >= 3.6


You can install “pytest-tape” via pip from PyPI:

$ pip install pytest-tape


Just use tape fixture in any of the tests and assert dictionary of results with it.

def test_correctness(tape):
    result_of_calc = {
    'a': [1,2,3], 'b':'Another_Random_Result', 'c': 45.99
    assert tape == result_of_calc

First time the tests fails, tape writes to yaml file. Second and all subsequent times you run the test - it compares the result with what is on tape.


Contributions are very welcome. Tests can be run with tox, please ensure the coverage at least stays the same before you submit a pull request.


Distributed under the terms of the MIT license, “pytest-tape” is free and open source software


If you encounter any problems, please file an issue along with a detailed description.


This pytest plugin was generated with Cookiecutter along with @hackebrot’s cookiecutter-pytest-plugin template.

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