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test: fix flaky test-fs-watchfile on macOS #13252

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Trott wants to merge 1 commit into from
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test: fix flaky test-fs-watchfile on macOS #13252

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9 changes: 6 additions & 3 deletions test/parallel/test-fs-watchfile.js
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Original file line number Diff line number Diff line change
Expand Up @@ -72,12 +72,15 @@ if (common.isLinux || common.isOSX || common.isWindows || common.isAix) {
if (err) assert.fail(err);

fs.watch(dir, common.mustCall(function(eventType, filename) {
clearInterval(interval);
this._handle.close();
assert.strictEqual(filename, 'foo.txt');
}));

fs.writeFile(`${dir}/foo.txt`, 'foo', common.mustCall(function(err) {
if (err) assert.fail(err);
}));
const interval = setInterval(() => {
fs.writeFile(`${dir}/foo.txt`, 'foo', common.mustCall(function(err) {
if (err) assert.fail(err);
}));
}, 1);
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@refack refack May 27, 2017

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[question] is 1 safe? does it not cause a busy-wait-ish situation?

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@refack refack May 27, 2017

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maybe change to try {fs.writeFileSych ...?

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@Trott Trott May 27, 2017

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is 1 safe?

It won't block the event loop or anything like that, if that's what you mean. The way intervals work, the next one only gets added to the queue after the first one finishes, and gets added to execute in the next tick of the event loop at the earliest.

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@refack refack May 27, 2017

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I figured it will not block the loop, but maybe stress the I/O. Although obviously the process shouldn't be doing anything else at this point.
I agree it's a least arbitrary value you could put here, so guess it could be read a sort of nextTickInterval idiom?

}));
}