How to start unit-test old and new code?

Question

I admit that I have almost none experience of unittesting. I did a try with DUnit a while ago but gave up because there was so many dependencies between classes in my applicatio

Answer 1

When you work with legacy code, mock objetcs are really usefull to build unit tests.

Take a look at this question regarding Delphi and mocks: What is your favorite Delphi mocking library?