title: Mocha beforeAll hook and command line grep combination
body: <p>In my test suite I have a beforeAll hook that does the auth before tests are started.</p>
  <p>When I add the command line grep to run just some tagged tests, for example <em><strong>focus</strong></em> in order to isolate the run just for that tests, the beforeAll hook is not triggered and I need to move the auth to the test case.</p>
  <p>Is it possible to have the hook also triggered with grep ?</p>