public static void ClassInitialize()
{
//get a OSS client object
_ossClient = OssClientFactory.CreateOssClient();
//get current class name, which is prefix of bucket/object
_className = TestContext.CurrentContext.Test.FullName;
_className = _className.Substring(_className.LastIndexOf('.') + 1).ToLowerInvariant();
//create the bucket
_bucketName = OssTestUtils.GetBucketName(_className);
_ossClient.CreateBucket(_bucketName);
//create sample object
_keyName = OssTestUtils.GetObjectKey(_className);
_keyName += ".jpg";
_process = "image/resize,m_fixed,w_100,h_100";
_localImageFile = "../../example.jpg";
_processedKey = "process/image" + _keyName;
_imageInfo = "{\n \"FileSize\": {\"value\": \"3587\"},\n \"Format\": {\"value\": \"jpg\"},\n \"ImageHeight\": {\"value\": \"100\"},\n \"ImageWidth\": {\"value\": \"100\"}}";
}