Testing PHP Applications: From Unit Tests to TDD

The book "Testing PHP Applications" is a practical guide that will help you master the culture of testing and learn to write reliable, maintainable, and secure web applications in PHP. Whether you are working on a small project or a corporate system, quality testing is the key to success.

What is this book about?

The book covers the full cycle of testing PHP applications: from basic unit tests to complex integration and functional testing scenarios. You will get acquainted with the main tools and methodologies:

• PHPUnit — setup, writing tests, assertions, data sets;
• Mock objects and stubs — code isolation, testing complex dependencies;
• TDD (Test-Driven Development) — development through testing, red-green-refactoring;
• Integration testing — working with databases, APIs, external services;
• CI/CD — automatic test execution, code quality in the pipeline;
• Code Coverage — coverage analysis, finding "blind spots".

Who is this book for?

The book will be useful for:

• PHP developers of any level — from junior to senior;
• team leads and architects who want to introduce a testing culture in the team;
• freelancers and product owners interested in code stability;
• everyone who wants to move from "blind refactoring" to confident changes.

What will you learn?

• How to write clean, isolated unit tests in PHPUnit;
• How to test interaction with databases, HTTP requests, and external APIs;
• How to organize test architecture in a project of any complexity;
• How to avoid common mistakes and anti-patterns in tests;
• How to integrate testing into the development process and CI/CD.

Each chapter contains practical examples ready to use in real projects. You will not just read theory — you will learn to test for real. The book is written in accessible language, with an emphasis on practice and industry best practices.

Start writing tests today — and your applications will become more reliable, and development faster and more predictable.