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));
}
}