title: moduleDirectories key does not make it possible to import my test utils
body: <p>I want to test my Expo React Native app with Jest and <code>@testing-lib/react-native</code>.</p>
  
  <p>I have the following set up in my <code>package.json</code>.</p>
  
  <pre><code>"jest": {
      "preset": "jest-expo",
      "moduleDirectories": [
        "node_modules",
        "test-utils"
      ]
    },
  </code></pre>
  
  <p>And my folder structure looks like this:</p>
  
  <pre><code>├──node_modules/
  ├──test-utils/
  ├──src/
  └──package.json
  </code></pre>
  
  <p><code>src/</code> contains the test files. I'm testing my configuration with this simple test at <code>src/index.test.js</code>:</p>
  
  <pre class="lang-js prettyprint-override"><code>import { assert } from 'test-utils';
  
  const sum = (a, b) =&gt; a + b;
  
  describe('sum', () =&gt; {
    assert({
      given: 'two numbers',
      should: 'add the numbers',
      actual: sum(1, 3),
      expected: 4,
    });
  });
  </code></pre>
  
  <p>Where <code>assert</code> is in <code>test-utils/index.js</code>:</p>
  
  <pre class="lang-js prettyprint-override"><code>const assert = ({
    given = undefined,
    should = '',
    actual = undefined,
    expected = undefined,
  } = {}) =&gt; {
    it(`given ${given}: should ${should}`, () =&gt; {
      expect(actual).toEqual(expected);
    });
  };
  
  export { assert };
  </code></pre>
  
  <p>If I run my tests I get the error:</p>
  
  <pre><code>Cannot find module 'test-utils' from 'index.test.js'
  </code></pre>
  
  <p>Why is that? I mean I have configured the <code>moduleDirectories</code> key?  How can you fix this? I'd really love to be able to import <code>assert</code> as an absolute path instead of a relative path.</p>