Testing Go (Golang) Applications: From Unit Tests to Integration Scenarios

The book "Testing Go (Golang) Applications" is a practical guide that will help you master all aspects of testing in the Go ecosystem. Whether you are writing microservices, CLI utilities, or web applications, this book will give you the tools to create reliable, maintainable, and stable code.

What is this book about?

The book covers the full testing cycle of Go applications — from simple unit tests to complex integration scenarios and benchmarks. You will learn how to use the built-in testing package, write table-driven tests, work with mocks and stubs, test HTTP servers, databases, and asynchronous code. Special attention is given to TDD (Test-Driven Development) approaches and organizing test infrastructure in real-world projects.

Who is this book for?

• Beginner Go developers who want to establish good testing habits from the start.
• Experienced programmers transitioning to Go from other languages who want to understand the specifics of testing in this ecosystem.
• Team leads and architects who need to organize the testing process in a team or implement CI/CD with quality coverage.
• Anyone already writing in Go but facing challenges when testing complex scenarios — working with databases, external APIs, goroutines.

What will you learn?

• How to write effective unit tests using testing and go test.
• Creating mocks and stubs for dependency isolation (gomock package, manual implementations).
• Integration testing with real databases (PostgreSQL, MySQL) and external services.
• Testing HTTP handlers, middleware, and clients.
• Writing benchmarks for performance optimization.
• Organizing the project's test structure, using test helpers and fixtures.
• Approaches to testing asynchronous code, goroutines, and channels.
• Implementing TDD in everyday Go development.
• Automating tests in CI/CD (GitHub Actions, GitLab CI).

Why is this book useful?

Unlike many resources, this book does not just list the functions of the testing package but shows real-world scenarios from practice. You will learn not only to write tests but also to design code so that it is testable from the start. The author shares techniques that will help you avoid common mistakes and save hours of debugging. The book is suitable both for self-study and for use as a desktop reference.

Make your Go code reliable and predictable — start testing correctly today!