function checkObjectProperties(obj) {
          assert.equal(typeof obj.name, 'string');
          assert.equal(typeof obj.lastModified, 'string');
          assert.equal(typeof obj.etag, 'string');
          assert(obj.type === 'Normal' || obj.type === 'Multipart');
          assert.equal(typeof obj.size, 'number');
          assert.equal(obj.storageClass, 'Standard');
          assert.equal(typeof obj.owner, 'object');
          assert.equal(typeof obj.owner.id, 'string');
          assert.equal(typeof obj.owner.displayName, 'string');
        }
Image processing uses different compression algorithms
and the performance may be inconsistent
between different regions