Book Image

Test-Driven Python Development

By : Siddharta Govindaraj
Book Image

Test-Driven Python Development

By: Siddharta Govindaraj

Overview of this book

This book starts with a look at the test-driven development process, and how it is different from the traditional way of writing code. All the concepts are presented in the context of a real application that is developed in a step-by-step manner over the course of the book. While exploring the common types of smelly code, we will go back into our example project and clean up the smells that we find. Additionally, we will use mocking to implement the parts of our example project that depend on other systems. Towards the end of the book, we'll take a look at the most common patterns and anti-patterns associated with test-driven development, including integration of test results into the development process.
Table of Contents (20 chapters)
Test-Driven Python Development
About the Author
About the Reviewers

The cycle continues

All the techniques mentioned in the last section help us isolate pieces of code and break dependencies with other classes. This allows us to introduce stubs and mocks, making it easier to write more detailed characterization tests. The Extract Method refactoring is used a lot and is a great technique to isolate small sections of code.

The whole process is iterative. In a typical session, we might look at a piece of code via pdb, and then decide to extract it to a method. We might then experiment with passing different inputs to the extracted method in the interactive shell, following which we might write a few characterization tests. We would then go back to another section of the class and write more tests after mocking or stubbing the new method, following which we might go back into pdb or the interactive shell to take a look at another piece of code.

Throughout the process, we keep making small changes that are unlikely to break and keep running all our existing characterization...