public function test500or503() { try { $client = new Client($this->configParams); $url = 'https://www.justcharge.me/OffAmazonPayments_Sandbox/2013-01-01'; $client->setMwsServiceUrl($url); $this->callPrivateMethod($client, 'invokePost', null); } catch (\Exception $expected) { $this->assertRegExp('/Maximum number of retry attempts./i', strval($expected)); } }