Sorry, I think we could just do `search.goToApp('app://calendar.gaiamobile.org')` here, just like https://github.com/mozilla-b2g/gaia/blob/master/apps/search/test/marionette/app_search_test.js#L32.
Just had bad comment in [bugzilla](https://bugzilla.mozilla.org/show_bug.cgi?id=995569#c3).