test/parallel/test-repl-require-after-write.js

'use strict';

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

tmpdir.refresh();

const requirePath = JSON.stringify(tmpdir.resolve('non-existent.json'));

// Use -i to force node into interactive mode, despite stdout not being a TTY
const child = spawn(process.execPath, ['-i']);

let out = '';
const input = `try { require(${requirePath}); } catch {} ` +
              `require('fs').writeFileSync(${requirePath}, '1');` +
              `require(${requirePath});`;

child.stderr.on('data', common.mustNotCall());

child.stdout.setEncoding('utf8');
child.stdout.on('data', (c) => {
  out += c;
});
child.stdout.on('end', common.mustCall(() => {
  assert.ok(out.endsWith('> 1\n> '));
}));

child.stdin.end(input);