My Way of doing TDD (Test Driven Development)

This is more of an instructional video I am doing for the new summer interns on how things work here inside our company.
I want to show exactly what is the process of developing a new class, starting from the most concreate and obvious example and adding incrementally levels of abstraction until all the required features were incorporated in the code, a class is available with its respective unit test (GTest in the case).
Video is LONG, almost 1:30 hours so feel free to skip around.