Simple TDD pilot project

First TDD project done by the group.

Requirement:
Calculate the compound interest per business-day between two dates.
Saturdays and Sundays are non-business days.

Experience with testing so far:
As we went through this simple requirement, we came up with more questions as to what exactly is a "business day" other than just Saturdays or Sundays. TDD has found holes in the requirement statement that needed clarification. Which is something, most developers run into at some point on a project.

You can download the .zip file of the actual project we worked on so everyone can pick up where we left off.