title: How to tell JSHint to ignore all undefined variables in one file?
body: <p>In Karma tests, there are a lot of global variables and functions, which JSHint complains about (it is integrated into my editor). </p>
  
  <p>How can I tell JSHint to ignore all undefined variables in this one specific file? I would expect <code>/* jshint undef: false */</code> to turn off these warning, but it doesn't.</p>