title: Export node variable in windows like on mac
body: <p>I would like to pass variables to a mocha test, which is not as simple as expected. Passing a variable like this: </p>
  
  <pre><code>npm run test --scope=28
  </code></pre>
  
  <p>is not possible, because mocha will catch the input. I also tried to use the npm minimist package and using a user prompt failed also.</p>
  
  <p>Anyway my colleagues are using a mac and are able to pass an env variable by using this command</p>
  
  <pre><code>export testscope="18" &amp;&amp; npm run test
  </code></pre>
  
  <p>But unfortunately this will not work in Windows. So my question is, is there a similar export command for Windows?</p>