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* fix(#4306): forward real bytes through io.test.cjs's fault-injection mocks The bug #1008 fault-injection tests mock fs.writeSync scoped only by file descriptor. On their "success" arms (the retry-after-EAGAIN/EINTR call, and the short-write simulation) they fabricated a return byte count without ever calling the real writeSync -- the bytes went into a local array and nowhere else. node:test's process-isolation runner (default on Node >= 22) reads each test file's own stdout to parse its child-to-parent result protocol. If the runner's own reporter write for an adjacent test lands on fd 1 while one of these mocks is installed, that write was silently swallowed instead of reaching the real pipe -- observed in CI as "Unable to deserialize cloned data" (a corrupted/truncated byte stream on the parent's read side), not a thrown exception. Every "success" arm now forwards the real bytes to orig()/restore() instead of fabricating a return value, so anything else sharing the fd during the mocked window still gets its bytes delivered for real. writeAllSync (the only production caller reaching this mock) always passes a Buffer, so the forwarded calls use the buffer-form fs.writeSync overload unambiguously. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> * fix(#4306): extend fault-injection fd-swallow fix across the whole suite The originally-fixed instance (tests/io.test.cjs) was one occurrence of a copy-pasted defect: mocked fs.writeSync arms fabricated a return byte count without ever forwarding the call to the real fs.writeSync, silently discarding bytes. Under node:test's process-isolated runner, the parent reads the child's real stdout to parse v8-serialized report frames interleaved with plain output (confirmed against node's own lib/internal/test_runner/runner.js and a matching upstream issue, nodejs/node#64061) — a swallowed write on that fd corrupts the parent's parse ("Unable to deserialize cloned data"). Adds a shared, safe capture helper to tests/helpers.cjs, captureFdSync(fd, fn): it always forwards every write to the real fs.writeSync first, then records only the observed fd's bytes, sliced by the real return count (not the requested length), decoded once via Buffer.concat so a short write can't split a multi-byte codepoint across two decodes. 17 test files migrate their local copy of the unsafe mock to this shared helper. tests/worktree-base-ref.test.cjs keeps a narrower in-place fix instead (it needs to record every fd a write touched, which the shared helper doesn't expose). tests/io.test.cjs gets two follow-up correctness fixes on top of the already-committed forwarding fix: the EAGAIN/EINTR/short-write arms now derive their recorded chunk from the real return count everywhere (including the string-form overload), and the short-write test no longer forces a Buffer-shaped truncation call onto a string-form write that could land on the same fd. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> --------- Co-authored-by: sim <sim@local> Co-authored-by: Claude Sonnet 5 <noreply@anthropic.com>
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