title: Using a single command to run different tests in different modes
body: <p>I have two command lines:</p>
  <pre><code>testcafe firefox ./tests/desktop/*.js
  testcafe 'chrome:emulation:device=iphone X' ./tests/mobile/*.js
  </code></pre>
  <p>How can I combine these two command lines into one command line?</p>
  <p>For example:</p>
  <pre><code>testcafe 'chrome:emulation:device=iphone X' ./tests/mobile/*.js, firefox ./tests/desktop/*.js
  </code></pre>