add tests [easy]
add tests [easy]

Reviewed By: yuxuanchen1997

Differential Revision: D31918309

fbshipit-source-id: 37a0a9b169b0524ca0e08f6b9575bd324c6f15f3

facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex