title: Jest test formatting -- __tests__ vs *.test.js
body: <p>I'm working in a react codebase where we have test files labeled </p>
  
  <pre><code>__tests__
  </code></pre>
  
  <p>The files inside look like this</p>
  
  <p>filename.js</p>
  
  <p>Previously when I've used jest/enzyme, I've had test files formatted like this</p>
  
  <p>filename.test.js</p>
  
  <p>I am assuming that when you put a file inside a folder with the title </p>
  
  <pre><code>__tests__ 
  </code></pre>
  
  <p>you can leave the .test part off? I can't seem to find a solid answer on topic. Does anyone have some insight into the formatting functionality? </p>