Fix unit test for flexBasis
Fix unit test for flexBasis

Summary: Fix unit test for flexBasis

Reviewed By: emilsjolander

Differential Revision: D4572394

fbshipit-source-id: ce0b3cd28b5c8a9910106308c561c95d1b3866e9

facebook/css-layout,yihuang/css-layout,yihuang/css-layout,facebook/css-layout,facebook/css-layout,facebook/css-layout,yihuang/css-layout,yihuang/css-layout,facebook/css-layout,facebook/yoga,facebook/yoga,facebook/yoga,yihuang/css-layout,yihuang/css-layout,facebook/css-layout,facebook/yoga,facebook/css-layout,yihuang/css-layout,facebook/yoga,yihuang/css-layout,facebook/yoga,facebook/css-layout,yihuang/css-layout,facebook/yoga,facebook/yoga,yihuang/css-layout,facebook/css-layout,facebook/yoga,facebook/yoga