The Art of Unit Testing, Third Edition: with examples in JavaScript 3rd ed. Edition, Roy Osherove, Vladimir

Unit testing is more than just a collection of tools and practices—it’s a state of mind! This bestseller reveals the master’s secrets for delivering robust, maintainable, and trustworthy code.

Thousands of developers have learned to hone their code quality under the tutelage of

The Art of Unit Testing

. This revised third edition updates an international bestseller to reflect modern development tools and practices, as well as to cover JavaScript.

Inside

The Art of Unit Testing, Third Edition

you will learn how to:

Create readable, maintainable, and trustworthy tests

Work with s, stubs, mock objects, and isolation frameworks

Apply simple dependency injection techniques

Refactor legacy code with confidence

Test both frontend and backend code

Effective unit tests streamline your software development process and ensure you deliver consistent high-quality code every time. With practical examples in JavaScript and Node, this hands-on guide takes you from your very first unit tests all the way to comprehensive test suites, naming standards, and refactoring techniques. You’ll explore test patterns and organization, working with legacy code and even “untestable” code. The many tool-agnostic examples are presented in JavaScript and carefully designed so that they apply to code written in any language.

About the technology

The art of unit testing is more than just learning the right collection of tools and practices. It’s about understanding what makes great tests tick, finding the right strategy for each unique situation, and knowing what to do when the testing process gets messy. This book delivers insights and advice that will transform the way you test your software.

About the book

The Art of Unit Testing, Third Edition

shows you how to create readable and maintainable tests. It goes well beyond basic test creation into organization-wide test strategies, troubleshooting, working with legacy code, and “merciless” refactoring. You’ll love the practical examples and familiar scenarios that make testing come alive as you read. This third edition has been updated with techniques specific to object-oriented, functional, and modular coding styles. The examples use JavaScript.

What's inside

Deciding on test types and strategies

Test Entry & Exit Points

Refactoring legacy code

Fakes, stubs, mock objects, and isolation frameworks

Object-Oriented, Functional, and Modular testing styles

About the reader

Examples use JavaScript, TypeScript, and Node.js.

About the author

Roy Osherove

is an internationally-recognized expert in unit testing and agile software methodology.

Vladimir Khorikov

is the author of ’s

Unit Testing Principles, Practices, and Patterns

, a Pluralsight author, and a Microsoft MVP.

Table of Contents

PART 1

1 The basics of unit testing

2 A first unit test

PART 2

3 Breaking dependencies with stubs

4 Interaction testing using mock objects

5 Isolation frameworks

6 Unit testing asynchronous code

PART 3

7 Trustworthy tests

8 Maintainability

PART 4

9 Readability

10 Developing a testing strategy

11 Integrating unit testing into the organization

12 Working with legacy code

Appendix Monkey-patching functions and modules

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