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Chris Tate f67678b422 Pipe decoded socket strings and give lane jobs their own tmpdirs

After socket.setEncoding(enc), socket.pipe(destination) wrote the raw
bytes it read to the destination. It now writes the decoded strings, as
Node's pipe writes each string chunk: the destination receives their
UTF-8 bytes, and a partial character the decoder holds at EOF is written
before the destination ends.

tests/node-parallel/run.mjs runs each job's files with its own
TEST_THREAD_ID, as Node's test runner does, so test/common/tmpdir gives
concurrent files different directories instead of one shared .tmp.0.

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common

Match Node's socket encodings, rejected writes and event loop liveness

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README.md

Pipe decoded socket strings and give lane jobs their own tmpdirs

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run.mjs

Pipe decoded socket strings and give lane jobs their own tmpdirs

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verdict.mjs

Compare termination signals and resolve the Node checkout path in the test/parallel runner

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README.md

Node test/parallel files

run.mjs builds files from a Node.js checkout's test/parallel with scriptc, runs each executable in that directory, and compares its exit status with Node's. It records a verdict per file: pass (the same exit code, or the same terminating signal), fail (a different exit code or signal), or refused (the build failed), with the first error line.

git clone --depth 1 --branch v24.22.0 https://github.com/nodejs/node /path/to/node
node tests/node-parallel/run.mjs --node /path/to/node --pattern '^test-(url-|whatwg-url-|querystring)'

Options:

--node: a Node.js checkout, or its test directory. Use the version in .node-version.
--pattern: a regular expression over file names in test/parallel.
--common: minimal (the default) or node.
- minimal copies the selected files into <out>/tree/test/parallel and uses common/index.cjs, common/wpt.cjs and common/tmpdir.cjs from this directory as test/common/index.js, test/common/wpt.js and test/common/tmpdir.js, with the checkout's test/fixtures, test/common/fixtures.js, test/common/dns.js and test/common/internet.js. The minimal common has the helpers these files use (mustCall, mustNotCall, mustSucceed, skip, expectWarning, expectsError, invalidArgTypeHelper, spawnPromisified, hasIntl, isWindows, PIPE, ...) with Node's semantics, so a verdict measures the module under test rather than Node's full test/common.
- node builds the files in place against Node's own test/common.
--out: where executables and results go (default node_modules/.cache/scriptc-node-parallel).
--cli: the scriptc CLI entry (default packages/cli/dist/main.js).
--jobs: concurrent files (default 4).

Node runs each file with its // Flags: line. Each job runs its files with its own TEST_THREAD_ID, as Node's test runner does, so test/common/tmpdir gives concurrent files different directories. Results are written to <out>/results.json and <out>/results.md.

Before a lane relies on the minimal common, run its files under Node in <out>/tree/test/parallel: they should all pass there.