add an unit test for FiberEvent
add an unit test for FiberEvent

Change-Id: I7d87ccd83828f937c714c8675c41cc17f9fb337b
Signed-off-by: Kefu Chai <ef1142690fdf7c5d47bbd7e2a7a410478308cc21@mozy.com>
Reviewed-on: https://gerrit.dechocorp.com/66376
Reviewed-by: Jenkins <49695b0f9c673fd73dab0ff3f84b5ced9302cc6a@mozy.com>
Reviewed-by: Kevin Cai <c4f49ef5a44534d46de426dda18a118a2ca4debf@mozy.com>

mozy/mordor,mozy/mordor,mozy/mordor