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test: improve error reporting in test-child-process-pipe-dataflow #37632

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Trott merged 1 commit into from
Mar 9, 2021
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test: improve error reporting in test-child-process-pipe-dataflow #37632

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test: improve error reporting in test-child-process-pipe-dataflow 
When the test fails, it usually ends up failing on the assertion that
`wc` did not find as many bytes as it expected. That may not be
helpful if it is caused by a failure earlier in the command
pipeline ( cat | grep | wc ). Move the byte check to
`process.on('exit')` so that other error handlers that report the
existence of errors run first.

Refs: #25988

PR-URL: #37632
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
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@Trott
Trott committed Mar 9, 2021
commit 7f54dd4f0704c73f48a2377e16a8e537a83b45da
4 changes: 2 additions & 2 deletions test/parallel/test-child-process-pipe-dataflow.js
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Original file line number Diff line number Diff line change
Expand Up @@ -66,8 +66,8 @@ const MB = KB * KB;
wcBuf += data;
}));

wc.on('close', common.mustCall(() => {
process.on('exit', () => {
// Grep always adds one extra byte at the end.
assert.strictEqual(wcBuf.trim(), (MB + 1).toString());
}));
});
}