adds explanation of what a test looks like!
adds explanation of what a test looks like!

katkelemen/learn-tdd,RachBLondon/learn-tdd,aredo/learn-tdd,tormod17/learn-tdd,dwyl/learn-tdd,ishan-marikar/learn-tdd,jamesharrington/learn-tdd,tormod17/learn-tdd,naazy/learn-tdd,nelsonic/learn-tdd,katkelemen/learn-tdd,naazy/learn-tdd,mantagen/learn-tdd,nelsonic/learn-tdd,ishan-marikar/learn-tdd,aredo/learn-tdd,RachBLondon/learn-tdd,mantagen/learn-tdd,sohilpandya/learn-tdd,jamesharrington/learn-tdd,sohilpandya/learn-tdd,dwyl/learn-tdd