1'use strict'; 2const common = require('../common'); 3const fixtures = require('../common/fixtures'); 4const assert = require('assert'); 5 6const exec = require('child_process').exec; 7 8const nodePath = process.argv[0]; 9const script = fixtures.path('print-10-lines.js'); 10 11const cmd = `"${nodePath}" "${script}" | head -2`; 12 13exec(cmd, common.mustCall(function(err, stdout, stderr) { 14 assert.ifError(err); 15 const lines = stdout.split('\n'); 16 assert.strictEqual(lines.length, 3); 17})); 18