How to Profile and Identify Slow Tests?

Better Stack Team
Updated on May 15, 2024

You can easily profile the duration of tests using pytest to identify slow tests using the --durations=N option.

To display the execution time of every test function, set --durations to 0:

pytest --durations=0

If you want to identify the single slowest test function, use:

pytest --durations=1

For identifying a specific number of the slowest tests to investigate further, you can set values like 8, 20, or 50:

pytest --durations=20
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