Step 3: write the first failing test
Step 3: write the first failing test

This uses real Double, Call values and also the
actual CallLog. These are not application logic 
from the perspective of verify(), simply the place 
it gets its data from (as opposed to an argument, 
which is more typical).
testdouble/testdouble.js,testdouble/testdouble.js,testdouble/testdouble.js