[Bug]: TestT_Parallel does not detect missing delays #1436

What happened and what did you expect to happen?

mocktesting.TestT_Parallel leaves mt.ParallelDelay at its zero value. Its assertion compares after against before + delay in the opposite direction, so an implementation that returns immediately still passes. The test therefore does not check the configured minimum delay it says it covers.

Expected: configure ParallelDelay to the test delay and assert the measured elapsed duration is at least that delay.

Describe how to reproduce the bug

Run go test ./mocktesting -run '^TestT_Parallel$'. In the captured main source, the current test passes even when (*T).Parallel is temporarily made a no-op, demonstrating that the assertion does not catch a missing delay.

version

main at 34a13b0e5f1117f63a3d90a961abfeeede2e98af.

Relevant logs or stack trace

Not applicable; this is a test assertion gap, not a runtime failure.

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