add unit-test to build thrift file with structured annotation option
add unit-test to build thrift file with structured annotation option

Summary: This unit-test is just testing we can build thrift file with structured annotation option successfully.

Reviewed By: vitaut

Differential Revision: D30340554

fbshipit-source-id: 4e3b3c00008a1d5e94bfcf69eff59bfd227bff81

facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift