Test-Driven Development with Python

Test-driven development (TDD) is a development approach that flips traditional coding on its head by writing tests before writing the actual code. This powerful methodology helps developers write cleaner, more maintainable, and bug-resistant software. In the world of Python, TDD is not just a best practice; it is a game-changer. This book is your hands-on guide to mastering TDD the Pythonic way.

This book begins with the fundamentals of TDD, such as what it is, why it matters, and how to set up your development environment for test-first coding. Each chapter introduces you to core concepts like unit testing, test automation with unittest and pytest, mocking, refactoring, and continuous integration. You will build real Python applications through a TDD lens, progressing from simple functions to fully tested modules and components. A few chapters will explore TDD for APIs, working with databases, and using test doubles effectively, and each chapter ends with a practical mini-project to reinforce learning.

By the end of this book, you will not only be comfortable with writing tests first but also confident in designing cleaner architecture and delivering production-ready Python code faster. This book will also empower you to build smarter and ship with confidence.

WHAT YOU WILL LEARN
● Learn TDD principles to write reliable Python code faster.
● Use unittest and pytest to automate Python test coverage.
● Understand mocks and stubs to test isolated components.
● Develop APIs and apps using TDD for real-world readiness.
● Apply CI and refactoring techniques for clean, testable code.
● Design class constructor APIs and validate private object methods.
● Implement JWT authentication and deploy characterization tests on seams.
● Write failing tests first to drive incremental functional implementations.

WHO THIS BOOK IS FOR
This book is for Python developers, QA engineers, automation testers, and software engineers transitioning into test-first coding. A basic understanding of Python programming is required; however, intermediate professionals can skip prior TDD experience to master building reliable applications.

1. Introduction to TDD and Python Setup
2. Unit Testing with Unittest
3. Embracing Pytest for Simpler Tests
4. Writing Test-first Functions
5. Incremental Implementation with TDD
6. TDD with Classes and Objects
7. Mocking, Stubbing, and Isolating Tests
8. Building a Calculator API with TDD
9. Testing Database Interactions
10. Test Coverage and Refactoring
11. Integrating TDD with Continuous Integration
12. TDD in Teams and Real-World Projects
13. Final Project, Full-stack Task Manager Using TDD
14. Securing, Scaling & Testing Legacy Code

Yagnanarayana Dande is a technology leader, entrepreneur, and software quality engineering professional with over 18 years of experience in Software testing, Test automation, data analytics, artificial Intelligence, and big data technologies. He is the Chief executive officer (CEO) of AIDO Home Healthcare, a division of DPDPD Private Limited, where he leads the development of AI-powered healthcare and digital transformation solutions.

A graduate of BITS Pilani with a bachelor of engineering (B.E.) degree and an LL.M. (Professional) in Criminology from National Law University, Delhi, he brings together expertise in technology, analytics, and legal studies. He holds professional certifications including Sun Certified Java Programmer (SCJP) and ISTQB Certified Tester – Foundation Level.

With extensive experience in Quality engineering, test automation, data analytics, big Data, and artificial intelligence, he has helped organizations deliver reliable and scalable technology solutions. Through test-driven development with Python, he shares practical industry knowledge and proven techniques for building high-quality software using a test-first approach.