emberjs/ember-dev — pull request #145 by rwjblue (2014-11-08 16:50:14+00:00)
Title: Ensure prod build assertions are only made once.

When running `expectAssertion(callbackFN)` `this.expecteds` was an empty array (because the assertion was already done) so it passed the previous guard.

Now we just check to see if `this.expecteds` AND `this.actuals` are empty before short curcuiting.