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test: refactor stdio handling in test-esm-cjs-main #25169

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test: refactor stdio handling in test-esm-cjs-main #25169

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19 changes: 9 additions & 10 deletions test/es-module/test-esm-cjs-main.js
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Original file line number Diff line number Diff line change
Expand Up @@ -8,21 +8,20 @@ const assert = require('assert');
const entry = fixtures.path('/es-modules/cjs.js');

const child = spawn(process.execPath, ['--experimental-modules', entry]);
let experimentalWarning = false;
let validatedExecution = false;
let stderr = '';
child.stderr.setEncoding('utf8');
child.stderr.on('data', (data) => {
if (!experimentalWarning) {
experimentalWarning = true;
return;
}
throw new Error(data.toString());
stderr += data;
});
let stdout = '';
child.stdout.setEncoding('utf8');
child.stdout.on('data', (data) => {
assert.strictEqual(data.toString(), 'executed\n');
validatedExecution = true;
stdout += data;
});
child.on('close', common.mustCall((code, signal) => {
assert.strictEqual(validatedExecution, true);
assert.strictEqual(code, 0);
assert.strictEqual(signal, null);
assert.strictEqual(stdout, 'executed\n');
assert.strictEqual(stderr, `(node:${child.pid}) ` +
'ExperimentalWarning: The ESM module loader is experimental.\n');
}));