Add unit test for indexOfStep
Add unit test for indexOfStep

cornelltech/ResearchKit,mluedke2/ResearchKit,mluedke2/ResearchKit,weijentu/ResearchKit,boland25/ResearchKit,md0u80c9/ResearchKit,YuanZhu-apple/ResearchKit,oliverschaefer/ResearchKit,YuanZhu-apple/ResearchKit,md0u80c9/ResearchKit,md0u80c9/ResearchKit,jeremiahyan/ResearchKit,boland25/ResearchKit,mluedke2/ResearchKit,oliverschaefer/ResearchKit,cornelltech/ResearchKit,chb/ResearchKit,oliverschaefer/ResearchKit,YuanZhu-apple/ResearchKit,YuanZhu-apple/ResearchKit,boland25/ResearchKit,chb/ResearchKit,weijentu/ResearchKit,weijentu/ResearchKit,chb/ResearchKit,weijentu/ResearchKit,md0u80c9/ResearchKit,jeremiahyan/ResearchKit,boland25/ResearchKit,cornelltech/ResearchKit,chb/ResearchKit,oliverschaefer/ResearchKit,jeremiahyan/ResearchKit