node/test/parallel/test-repl-setprompt.js

// Copyright Joyent, Inc. and other Node contributors.
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'use strict';
require('../common');
const assert = require('assert');
const spawn = require('child_process').spawn;
const os = require('os');

const args = [
  '-e',
  'var e = new (require("repl")).REPLServer("foo.. "); e.context.e = e;',
];

const p = 'bar.. ';

const child = spawn(process.execPath, args);

child.stdout.setEncoding('utf8');

let data = '';
child.stdout.on('data', function(d) { data += d; });

child.stdin.end(`e.setPrompt("${p}");${os.EOL}`);

child.on('close', function(code, signal) {
  assert.strictEqual(code, 0);
  assert.ok(!signal);
  const lines = data.split('\n');
  assert.strictEqual(lines.pop(), p);
});