[Objc] Add test case in objc client

[geekerzp]

• Added test case for upload only file.
• Tested without issue:

Test Suite 'All tests' passed at 2015-09-25 16:43:42.907.
     Executed 26 tests, with 0 failures (0 unexpected) in 36.410 (36.435) seconds
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 01:17 min
[INFO] Finished at: 2015-09-25T16:43:43+08:00
[INFO] Final Memory: 11M/155M
[INFO] ------------------------------------------------------------------------