Fix tests

Author: tobz-nz

src/RollbarServiceProvider.php

@@ -90,11 +90,11 @@ public function register()
      */
     public function stop()
     {
-        $level = getenv('ROLLBAR_LEVEL') ?: $this->app['config']->get('services.rollbar.level', null);
-        $hasLevel = empty($level) === false || strtolower($level) == 'none';
-        $hasToken = !empty(getenv('ROLLBAR_TOKEN'));
+        $level = getenv('ROLLBAR_LEVEL') ?: $this->app->config->get('services.rollbar.level', null);
+        $hasLevel = empty($level) === false || strtolower($level) != 'none';
+        $hasToken = getenv('ROLLBAR_TOKEN');
         $hasConfig = $this->app['config']->has('services.rollbar');
 
-        return $hasLevel === false || $hasToken === false && $hasConfig === false;
+        return $hasLevel === false || ($hasToken === false && $hasConfig === false);
     }
 }