title: How specify test-files with .mocharc config file
body: <p>I currently run mocha tests with npm scripts like</p>
  <pre class="lang-sh prettyprint-override"><code>mocha test/mocha.js test/crc/mocha.js test/multibyte/test.js
  </code></pre>
  <p>I added additional three test files and I start to wonder maybe use configuration file like <code>.mocharc.js</code>, and call simply <code>mocha</code>, but what ever I try mocha always runs all .js files in &quot;test&quot; folder.</p>
  <ul>
  <li>I started with <a href="https://futurestud.io/tutorials/mocha-migrating-from-mocha-opts-to-mocharc-js-configuration-file" rel="nofollow noreferrer">this tutorial</a> where they use <code>file</code> property, but it wont work.</li>
  <li>Some SO answer points me to <a href="https://github.com/mochajs/mocha/blob/master/example/config/.mocharc.js" rel="nofollow noreferrer">mocha example on github</a> where they use <code>watch-files</code> property but it still wont work.</li>
  <li>I tried use absolute path, relative path</li>
  <li>according to <a href="https://mochajs.org/#-file-filedirectoryglob" rel="nofollow noreferrer">mocha official documentation</a> I should use <code>file</code> property, but it wont work</li>
  </ul>
  <p>All this is so confusing and I cant find any config file documentation, more than what file names should I use.</p>
  <p>Does anyone knows how I can run just these three test-files with config file ?</p>
  <p>I know I can use npm script like before, but maybe there is way ?</p>