feat(cli): add --random-order and --seed to randomize test order#757
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Shuffle test-file and per-file function execution order to surface hidden inter-test coupling. A seeded Fisher-Yates (LCG) makes the shuffle reproducible; each shuffle reseeds locally (mixing the seed with a per-file cksum), so it is subshell-safe and works under --parallel. The seed is printed for replay and generated when absent. --seed without --random-order is a no-op. Disabled by default. Closes #738
The tests parsed colored console output, which varies by TTY/output-mode/locale and failed in CI (empty capture; a color reset split 'seed:' from the number). Record dispatch order to a file instead, and assert the seed label only.
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🤔 Background
Related #738
Tests that only pass in declaration order hide real bugs (leaked globals, shared temp files, ordering dependencies). Randomizing execution order surfaces that coupling, and a printed seed makes any failure reproducible.
💡 Changes
--random-orderwith--seed <n>/BASHUNIT_SEEDto shuffle test-file order and per-file test order. Disabled by default.--parallel.--seedalone is a no-op.