Testing C# (.NET) Applications: From Unit Tests to E2E

The book "Testing C# (.NET) Applications" is a practical guide that will help you master all aspects of software testing on the .NET platform. Whether you are building web applications with ASP.NET Core, desktop solutions with WPF, or microservices, this book will be your reliable companion.

What is this book about?

• Fundamentals of Unit Testing: Get to grips with xUnit, NUnit, and MSTest frameworks, and learn to write isolated and reliable tests.
• Mocking and Stubs: Master Moq, NSubstitute, and FakeItEasy libraries for simulating dependencies.
• Integration Testing: Learn how to test databases (Entity Framework), APIs, and external services.
• Advanced Techniques: TDD (Test-Driven Development), parameterized tests, testing asynchronous code and multithreading.
• CI/CD and Automation: Integrating tests into GitHub Actions, Azure DevOps, and Jenkins pipelines.
• UI Testing: Working with Selenium, Playwright, and SpecFlow for end-to-end testing.
• Code Coverage and Code Quality: Setting up coverage reports, static analysis, and refactoring.

Who is this book for?

• Beginner and experienced C# developers looking to introduce a testing culture into their projects.
• Team Leads and architects who want to build reliable and testable systems.
• QA engineers transitioning into automation and mastering the .NET stack.

What will you learn?

• How to write clean and maintainable tests following the FIRST and AAA principles.
• How to properly organize test architecture and avoid brittle tests.
• How to test legacy code and refactor it without fear of breaking anything.
• How to set up continuous integration and get instant feedback.
• How to use patterns (Page Object, Builder, Fixture) to simplify tests.

All code examples are up-to-date for .NET 6/7/8 and Visual Studio 2022. The book contains over 50 practical examples ready for use in real projects.

Make your application reliable — start testing the right way!