How did you go about testing your program? What were the results of that testing?

I wrote two classes today. One was rectangle class and the other one was circle class. I had to make sure all the variables used were defined at the top, and I had to make sure I had two constructors. One was a default, and the other one had parameters. Then I wrote a driver to test both classes at once. The results of my testing were exactly what I wanted to do.