title: ember-cli-code-coverage mocha showing 0% coverage when there are tests
body: <p>I'm using <a href="https://github.com/kategengler/ember-cli-code-coverage" rel="noreferrer">ember-cli-code-coverage</a> with <a href="https://github.com/ember-cli/ember-cli-mocha" rel="noreferrer">ember-cli-mocha</a>.
  <br>When I run <code>COVERAGE=true ember test</code> I'm getting 0% coverage for statements, functions, and lines.
  <br>Yet, I have tests that are covering those sections. <em>Any I missing something in my setup?</em></p>
  <p><a href="https://i.stack.imgur.com/Oc9Yz.png" rel="noreferrer"><img src="https://i.stack.imgur.com/Oc9Yz.png" alt="enter image description here" /></a></p>
  <p>unit test file:</p>
  <pre class="lang-js prettyprint-override"><code>beforeEach(function() {
      controller = this.subject();
  });
  
  it('sets selectedImage to null', function() {
      expect(controller.get('selectedImage')).to.eql(null);
  });
  
  describe('setCoverageTest', function() {
      it('sets selectedImage to true', function() {
          expect(controller.get('selectedImage')).to.eql(null);
          controller.setCoverageTest();
          expect(controller.get('selectedImage')).to.be.true;
      });
  });
  </code></pre>
  <p>config/coverage.js:</p>
  <pre><code>module.exports = {
    excludes: ['*/templates/**/*'],
    useBabelInstrumenter: true
  };
  </code></pre>