Test Driven Development (TDD) is one of the eXtreme Programming´s (XP) easiest practices to understand but at the same time difficult to implement. It is necessary to use complementary practices, appropriate tools, and follow carefully some rules for achieving good results. A real experiment creating an adequate environment for TDD was conducted in a small company. This study will show the results obtained. What are the advantages and disadvantages of each one of the practices? How to establish these practices in small company daily operations? What type of environment has to be built? Which tools? How much time and investment for implementing this kind of enhancement would be required? This work will present answers to these questions.