[anirudhsengar]

Metadata

• Reference Issue: Part of Migrate all unittests to pytest #1252
• New Tests Added: Yes (migrate existing tests to pytest style)
• Documentation Updated: No
• Change Log Entry: “Migrate test_extensions/test_functions.py to pytest-style tests”

Details

• This PR migrates test_functions.py from unittest.TestCase-based tests (openml.testing.TestBase) to pure pytest-style tests.
• It replaces the class-based TestInit with module-level test functions and introduces a small pytest fixture to manage the registration state of dummy extensions used in the tests.
• The new clean_test_extensions fixture calls the existing _unregister() helper before and after each test, ensuring the global extension registry is not polluted across tests.
• Assertions continue to use assert and pytest.raises, consistent with the style already used in test_utils.py.
• No functional changes to the OpenML extensions API are introduced; only the test implementation is refactored.

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 53.84%. Comparing base (13dc887) to head (1ccc149).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1440   +/-   ##
=======================================
  Coverage   53.84%   53.84%           
=======================================
  Files          63       63           
  Lines        5230     5230           
=======================================
  Hits         2816     2816           
  Misses       2414     2414           

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[PGijsbers]

Thanks for the contribution!