public function testBuildSignaturePOSTWithFile()
 {
     $param = array('SecretId' => $this->request->getConfig('secretId'), 'Nonce' => 345122, 'Region' => 'gz', 'Timestamp' => 1408704141, 'Action' => 'DescribeInstances', 'Filepath' => $this->request->curl_file_create('/tmp/test1.txt'));
     $sig = $this->request->buildSignature($param, 'POST');
     $this->assertEquals('qiEVyAdhwHvQFCCpU5dDef3S8PA=', $sig);
 }