Add test to assert default values
Add test to assert default values

Summary: assert default values in test

Reviewed By: splhack

Differential Revision: D4064659

fbshipit-source-id: f7bf06232ebbbaa72c0202c5d9f15dd0d8005e22

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