Fixed errors in invalid plant tests
Fixed errors in invalid plant tests

https://app.asana.com/0/201562232002815/205761505868163

DannyEaton/growify,rdicharry/growify-fork-20161209,DannyEaton/growify,rdicharry/growify-fork-20161209,DannyEaton/growify,rdicharry/growify-fork-20161209