Summary

In this chapter, we have introduced the potential benefits and costs of automated testing, with a focus on the concept of testability, which we defined as the degree to which a system can be verified to work as expected. We learned about the importance of maintaining a positive balance between the benefits of testing and the cost of creating and maintaining tests. We then wrote a couple of simple unit tests and ran them with RSpec. Finally, we looked at different approaches to automated testing, from unit tests to TDD and BDD.