Testing Go (Golang) Applications: From Unit Tests to Production

The book "Testing Go (Golang) Applications" is a practical guide that will help you master all aspects of software testing in Go. From simple unit tests to complex integration scenarios and load testing, you will learn how to build reliable, maintainable, and high-performance applications.

What is this book about?

Go (Golang) is renowned for its simplicity and efficiency, but without proper testing, even the most elegant code can contain hidden bugs. This book bridges the gap between basic language knowledge and a professional approach to quality assurance. You will not just learn to write tests — you will understand how to build an application architecture that is easy to test.

What will you learn?

• Testing basics in Go: the testing package, Test functions, Table-driven tests, subtests.
• Mocks and stubs: how to isolate dependencies using interfaces, the testify and gomock libraries.
• Integration tests: working with databases, HTTP servers, external APIs, and file systems.
• Benchmarks and profiling: how to measure performance, write benchmarks, and optimize code.
• Testing concurrent code: goroutines, channels, the race detector, and testing parallel operations.
• CI/CD and automation: setting up GitHub Actions, GitLab CI, integration with linters and coverage reports.
• Best practices: how to write readable tests, avoid brittle tests, and manage test data.

Who is this book for?

• Junior developers — who have just started learning Go and want to build good habits from the start.
• Middle developers — looking to deepen their knowledge of testing, mocking, and performance.
• Team Leads and architects — who need to instill a testing culture in their team.
• DevOps engineers — responsible for CI/CD pipelines and build quality.

Why should you read it?

Unlike many books that simply list the functions of the testing package, this guide offers a systematic approach. You will see real examples from production projects, learn how to test complex scenarios (e.g., working with databases or external services), and learn to avoid common mistakes. All code examples are available for download and ready to run.

The book is written in simple and clear language, with an emphasis on practice. After reading it, you will be able to confidently write tests for any Go application, whether it's a microservice, CLI utility, or web server.

Bonus: at the end of the book, you will find a checklist for test code review and templates for setting up CI/CD.