title: Casperjs "casper.test property is only available using the `casperjs test` command" but not calling casper test
body: <p>The error:</p>
  
  <pre><code>casper.test property is only available using the `casperjs test` command
  </code></pre>
  
  <p>Searched my entire codebase for "casper.test", "this.test", "@test", etc, and none are present. Looking at the casper code, one of these needs to be triggered for this error to be raised.</p>
  
  <p>The error is intermittent and only occurs on some casper runs. Has anyone else gotten this bug? I'm running <code>1.1.0-beta3</code>. </p>