added test parameters for "Plant"s in CombativePlantTest tests, finished tests for get(Valid/Invalid)CombativePlantsByPlantId() methods.
added test parameters for "Plant"s in CombativePlantTest tests, finished tests for get(Valid/Invalid)CombativePlantsByPlantId() methods.

https://app.asana.com/0/201954860780444/205761505868177

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