Simon Willison • 12/5/2025

TIL: Subtests in pytest 9.0.0+

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This article discusses the introduction of subtests in pytest 9.0.0, a feature allowing programmatic test creation within a single test function. It compares subtests to the traditional pytest.mark.parametrize decorator, highlighting advantages like potential speed improvements and the ability to run setup code before each subtest.

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#testing #unit testing #pytest
TIL: Subtests in pytest 9.0.0+

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