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'use strict'; const common = require('../common'); const cp = require('child_process'); const assert = require('assert'); // Windows' `echo` command is a built-in shell command and not an external // executable like on *nix const opts = { shell: common.isWindows }; const p = cp.spawn('echo', [], opts); p.on('close', common.mustCall((code, signal) => { assert.strictEqual(code, 0); assert.strictEqual(signal, null); spawnWithReadable(); })); p.stdout.read(); const spawnWithReadable = () => { const buffer = []; const p = cp.spawn('echo', ['123'], opts); p.on('close', common.mustCall((code, signal) => { assert.strictEqual(code, 0); assert.strictEqual(signal, null); assert.strictEqual(Buffer.concat(buffer).toString().trim(), '123'); })); p.stdout.on('readable', () => { let buf; while ((buf = p.stdout.read()) !== null) buffer.push(buf); }); };