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

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

var replserver = new repl.REPLServer();

replserver._inTemplateLiteral = true;

// `null` gets treated like an empty string. (Should it? You have to do some
// strange business to get it into the REPL. Maybe it should really throw?)

assert.doesNotThrow(() => {
  replserver.emit('line', null);
});

replserver.emit('line', '.exit');