40 lines
1.4 KiB
JavaScript
40 lines
1.4 KiB
JavaScript
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'use strict';
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const common = require('../common');
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const assert = require('assert');
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const { promisify } = require('util');
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const execFile = promisify(require('child_process').execFile);
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// Test that --trace-sync-io works. In particular, a warning should be printed
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// when it is enabled and synchronous I/O happens after the first event loop
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// turn, and no warnings should occur when it is disabled or synchronous I/O
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// happens before the first event loop turn is over.
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if (process.argv[2] === 'late-sync-io') {
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setImmediate(() => {
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require('fs').statSync(__filename);
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});
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return;
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} else if (process.argv[2] === 'early-sync-io') {
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require('fs').statSync(__filename);
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return;
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}
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(async function() {
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for (const { execArgv, variant, warnings } of [
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{ execArgv: ['--trace-sync-io'], variant: 'late-sync-io', warnings: 1 },
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{ execArgv: [], variant: 'late-sync-io', warnings: 0 },
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{ execArgv: ['--trace-sync-io'], variant: 'early-sync-io', warnings: 0 },
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{ execArgv: [], variant: 'early-sync-io', warnings: 0 },
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]) {
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const { stdout, stderr } =
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await execFile(process.execPath, [...execArgv, __filename, variant]);
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assert.strictEqual(stdout, '');
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const actualWarnings =
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stderr.match(/WARNING: Detected use of sync API[\s\S]*statSync/g);
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if (warnings === 0)
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assert.strictEqual(actualWarnings, null);
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else
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assert.strictEqual(actualWarnings.length, warnings);
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}
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})().then(common.mustCall());
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