public static function setUpBeforeClass()
 {
     self::$client = new Client();
     $getCampaignsStream = Stream::factory(JsonLoader::getCampaignsJson());
     $getCampaignStream = Stream::factory(JsonLoader::getCampaignJson());
     $getPreviewStream = Stream::factory(JsonLoader::getPreviewJson());
     $mock = new Mock([new Response(200, array(), $getCampaignsStream), new Response(204, array()), new Response(400, array()), new Response(200, array(), $getCampaignStream), new Response(201, array(), $getCampaignStream), new Response(200, array(), $getCampaignStream), new Response(200, array(), $getPreviewStream)]);
     self::$client->getEmitter()->attach($mock);
 }