Test-Driven Development with Java

Create higher-quality software by writing tests first with SOLID and hexagonal architecture

By: Alan Mellor

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eText | 13 January 2023 | Edition Number 1

At a Glance

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Drive development with automated tests and feel confident about writing high-quality software

Key Features

Get up and running with common design patterns and best practices involved in TDD
Apply the rhythms of TDD - arrange, act, assert and red, green, refactor
Understand the challenges of implementing TDD in the Java ecosystem and build a plan

Book Description

Test-Driven Development enables developers to craft well-designed code and prevent defects. It is a simple, yet powerful, tool to focus us on the design of our code, whilst automatically checking that our code works correctly. Mastering TDD will instill some efficient design patterns and help you become an excellent software architect.

The book will begin by getting the basics by explaining good code and bad code, bursting common myths, and explaining why Test-driven development is crucial. Then we will gradually move toward building a sample application using TDD, where we will apply the two key rhythms of red, green, refactor and arrange, act, assert. We will lean how to bring external systems like databases under control by using dependency inversion and test doubles. We will then delve into some advanced design techniques like SOLID patterns, Refactoring and Hexagonal Architecture. Using the Test Pyramid as a guide, we will balance our use of fast, repeatable unit tests against integration tests. Towards the end of the book, you will work towards implementing TDD in real-world use cases and scenarios, developing a modern REST microservice backed by a Postgres database in Java 17.

By the end of this book, you will be thinking differently about how you design code for simplicity and how correctness can be baked in as you go.

What you will learn

Write effective test cases in Java
Explore how TDD can be incorporated into crafting software
Learn to write reusable and robust code in Java
Uncover common myths about TDD and understand its effectiveness
Understand the accurate rhythm of implementing TDD
Understand the process of refactoring and how it affects the TDD process

Who This Book Is For

The book is targeted at expert java developers and software architects crafting high-quality software in Java. This book can be picked up by anyone with strong working experience in Java and planning to use Test-driven development for their upcoming projects.