title: Mocha tests don't run with Webpack and mocha-loader
body: <h2>Background</h2>
  
  <p>I am porting some npm scripts to Webpack loaders to better learn how Webpack works and I’ve got everything working except for my Mocha tests: I have one failing test, but it is not showing that Mocha is being run with the <code>mocha-loader</code> or that the test is failing:</p>
  
  <p><a href="https://i.stack.imgur.com/6JaUy.png" rel="noreferrer"><img src="https://i.stack.imgur.com/6JaUy.png" alt="enter image description here"></a></p>
  
  <h2>Question</h2>
  
  <p>What do I need to do differently to get all <code>src/**/*.test.js</code> files to run with with Mocha in Webpack?</p>
  
  <h1>Steps to reproduce</h1>
  
  <ol>
  <li>Clone <a href="https://github.com/trevordmiller/webpack-loaders-playground" rel="noreferrer">https://github.com/trevordmiller/webpack-loaders-playground</a></li>
  <li>Run <code>npm test</code> to see how tests should work</li>
  <li>Run <code>npm run dev</code> to see how tests don't run with Webpack</li>
  </ol>