Add stub for afterApplicationCreated() method

Author: ssfinney

tests/Stubs/MailTrackingStub.php

@@ -14,6 +14,18 @@ class MailTrackingStub extends PHPUnit_Framework_TestCase
 {
     use MailTracking;
 
+    /**
+     * Stubs Laravel's afterApplicationCreated() method so that tests can run normally
+     *
+     * @param  callable  $callback
+     *
+     * @return void
+     */
+    public function afterApplicationCreated(callable $callback)
+    {
+        call_user_func($callback);
+    }
+
     /**
      * Public method in the stub to expose the protected email collection
      *