I am looking for a job in Vb. while attending one of the interviews, the question put to me was

How do you test your application in VB?

I am a freelancer for the past one year. I have developed only one project and installed it successfully. I did not use any tools for testing.

I have 2 questions.
1. What are the testing tools for VB
2. How do you test an application or a project WITHOUT the assistance of a testing tool.