test/parallel/test-force-repl.js

'use strict';
const common = require('../common');
const assert = require('assert');
const spawn = require('child_process').spawn;

// Spawn a node child process in interactive mode (enabling the REPL) and
// confirm the '> ' prompt and welcome message is included in the output.
const cp = spawn(process.execPath, ['-i']);

cp.stdout.setEncoding('utf8');

let out = '';
cp.stdout.on('data', (d) => {
  out += d;
});

cp.stdout.on('end', common.mustCall(() => {
  assert.strictEqual(out, `Welcome to Node.js ${process.version}.\n` +
                        'Type ".help" for more information.\n> ');
}));

cp.stdin.end('');