What this book covers
The book covers TDD and its .NET ecosystem of IDEs and libraries and goes through setting up the environment. The book starts by covering the topics that form the prerequisites for TDD, which are dependency injection, unit testing, and test doubles. Then, after covering TDD and its best practices, the book dives into building an application from scratch using domain-driven design as an architecture.
The book also covers the basics of building a continuous integration pipeline, dealing with legacy code that wasn’t written with testability in mind, and finishing with ideas for rolling out TDD into your organization.
Chapter 1, Writing Your First TDD Implementation, doesn’t have a long introduction or theory but rather dives directly into IDE selection and writing your first TDD implementation to get a taste of flavor of the content of the book.
Chapter 2, Understanding Dependency Injection by Example, revises advanced OOP principles needed to understand the concept of dependency injection and provides multiple examples.
Chapter 3, Getting Started with Unit Testing, offers a simple introduction to xUnit and unit-testing basics.
Chapter 4, Real Unit Testing with Test Doubles, goes through stubbing, mocking, and NSubstitute, and then discusses more testing categories.
Chapter 5, Test-Driven Development Explained, demonstrates how to write unit testing but in TDD style, and discusses the pros and cons.
Chapter 6, The FIRSTHAND Guidelines of TDD, details the best practices of unit testing and TDD.
Chapter 7, A Pragmatic View of Domain-Driven Design, introduces DDD, services, and repositories.
Chapter 8, Designing an Appointment Booking App, outlines the specification for a real-life app to be implemented later with a DDD architecture and the TDD style.
Chapter 9, Building an Appointment Booking App with Entity Framework and Relational DB, demonstrates an example of a TDD application using a relational DB backend.
Chapter 10, Building an App with Repositories and Document DB, demonstrates an example of a TDD application using a document DB and the repository pattern.
Chapter 11, Implementing Continuous Integration with GitHub Actions, shows how to use GitHub Actions to build a CI pipeline for the application in Chapter 10.
Chapter 12, Dealing with Brownfield Projects, outlines the thinking process when considering TDD and unit testing for legacy projects.
Chapter 13, The Intricacies of Rolling Out TDD, explains the train of thought when getting your organization to adopt TDD.
Appendix 1, Commonly Used Libraries with Unit Tests, shows some quick examples of MSTest, NUnit, Moq, Fluent Assertions, and Auto Fixture.
Appendix 2, Advanced Mocking Scenarios, demonstrates a more complex mocking scenario with NSubstitute.
