I'd suggest adding test cases in which xlow<0 (and maybe also xhigh<0).
Find the alphabetic word product
Find state names that start with the letter N
Back to basics 11 - Max Integer
Back to basics 13 - Input variables
Side of a rhombus
Next Lower Power of B
The Dark Side of the Die
Lychrel Number Test (Inspired by Project Euler Problem 55)
ASCII Birthday Cake
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