52f23ac0a0
Windows CreateProcess caps lpCommandLine at 32,767 chars. The original `execFileSync(node, ['--test', ...546 paths])` exceeded that on every Windows runner and exited within ~70ms with no test output. Linux/macOS allow ~2 MB ARG_MAX so the same call worked there. `scripts/run-tests.cjs` now splits selected files into chunks that keep each spawn's argv under 28,000 chars (operator-overridable via RUN_TESTS_MAX_CMDLINE_CHARS), runs them sequentially, and reports the first non-zero exit. Cross-platform regression test forces chunking with a low ceiling and asserts the `run-tests: chunk N/M …` stderr marker. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
6 lines
690 B
Markdown
6 lines
690 B
Markdown
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type: Fixed
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pr: 3649
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---
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**`scripts/run-tests.cjs` no longer fails on Windows when invoking many test files at once** — Windows `CreateProcess` caps `lpCommandLine` at 32,767 chars, so an unchunked spawn of `node --test <546 paths>` aborted instantly with exit 1 and no test output (Linux/macOS allow ~2 MB so the same path worked there). The harness now batches selected files into chunks whose total argv stays under 28,000 chars and runs each chunk sequentially, reporting `run-tests: chunk N/M — K files` to stderr. The ceiling is overridable via `RUN_TESTS_MAX_CMDLINE_CHARS` for tuning and tests. Adds a cross-platform regression test that forces chunking with a low ceiling.
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