fix unit test error

oss/bucket.go

@@ -457,7 +457,7 @@ func (bucket Bucket) IsObjectExist(objectKey string) (bool, error) {
 
 	switch err.(type) {
 	case ServiceError:
-		if err.(ServiceError).StatusCode == 404 && err.(ServiceError).Code == "NoSuchKey" {
+		if err.(ServiceError).StatusCode == 404 {
 			return false, nil
 		}
 	}

oss/error_test.go

@@ -107,5 +107,5 @@ func (s *OssErrorSuite) TestServiceErrorEndPoint(c *C) {
 	</Error>`
 	serverError, _ = serviceErrFromXML([]byte(xmlBodyWithEndPoint), 406, "5C1B595ED51820B569C6A12F")
 	errMsg = serverError.Error()
-	c.Assert(strings.Contains(errMsg, "Endpoint=oss-cn-shenzhen.aliyuncs.com"), Equals, false)
+	c.Assert(strings.Contains(errMsg, "Endpoint=oss-cn-shenzhen.aliyuncs.com"), Equals, true)
 }