hard20 pts · first answer countstest-automationflaky-testspytest

A test that depends on set order

A Python test compares ", ".join(tags) with "gst, invoice, urgent", where tags is a set of strings. It passes and fails at random between runs. Why?

A.Python sets sort strings alphabetically only on Linux machinesB.join() is not thread-safe and mixes the order under pytest-xdistC.String hashing is randomised per process, so set iteration order can changeD.The test runner reorders strings to detect hidden dependencies

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A test that depends on set order

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