hard20 pts · first answer countsflaky-teststest-data-management

Tests fail only in parallel

UI tests pass when run one at a time but fail randomly when run with 4 parallel workers. All tests log in as qa_user1 and add items to its cart. What is the root cause and fix?

A.Shared mutable test data: workers change the same cart. Give each worker or test its own user and data, created through the API in setupB.The machine is too slow; add sleepsC.Parallel runs are always unreliable; disable themD.The browser version is wrong; downgrade it

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Tests fail only in parallel

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