public function testGetUserInfo()
 {
     try {
         $this->configParams['region'] = '';
         $client = new Client($this->configParams);
         $client->getUserInfo('Atza');
     } catch (\Exception $expected) {
         $this->assertRegExp('/is a required parameter./i', strval($expected));
     }
     try {
         $this->configParams['region'] = 'us';
         $client = new Client($this->configParams);
         $client->getUserInfo(null);
     } catch (\Exception $expected) {
         $this->assertRegExp('/Access Token is a required parameter and is not set./i', strval($expected));
     }
 }