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


Refactoring is the process of cleaning up code or changing a design using a sequence of very small steps. No new functionality is added or removed during the refactoring process. The aim of refactoring is to make the code better by eliminating some code smell. There are many types of refactoring, from the extremely simple going up to much more complex refactorings. Let us apply some of these to the code above.

The Rename Variable and Rename Method refactorings

These two are probably the two simplest refactorings. The names are self explanatory—the refactoring is to rename a variable or a method. Although simple, they are very important because poor variable and method names are very common code smells.

The following are the steps to apply the Rename Variable refactoring:

  1. Run all the tests to make sure they are passing.

  2. Change the name of the variable, and make the change in all the places where it is being used.

  3. Run all the tests again to make sure we didn't break anything.

The Rename...