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 testsWork with fakes, stubs, mock objects, and isolation frameworksApply simple dependency injection techniquesRefactor legacy code with confidenceTest both frontend and backend codeEffective 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.Purchase of the print book includes a free eBook in PDF, Kindle, and ePub formats from Manning Publications.About the technologyThe 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 bookThe 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 insideDeciding on test types and strategiesTest Entry & Exit PointsRefactoring legacy codeFakes, stubs, mock objects, and isolation frameworksObject-Oriented, Functional, and Modular testing stylesAbout the readerExamples use JavaScript, TypeScript, and Node.js.About the authorRoy Osherove is an internationally-recognized expert in unit testing and agile software methodology. Still an active coder, he consults and trains teams worldwide on the gentle art of unit testing and test-driven development. He is also the author of Elastic Leadership (Manning 2016). Roy’s blog is at ArtOfUnitTesting.com.Vladimir Khorikov is the author of Unit Testing Principles, Practices, and Patterns, Pluralsight author, and Microsoft MVP. He has mentored numerous teams on the ins and outs of unit testing. Table of ContentsPART 11 The basics of unit testing2 A first unit testPART 23 Breaking dependencies with stubs4 Interaction testing using mock objects5 Isolation frameworks6 Unit testing asynchronous codePART 37 Trustworthy tests8 MaintainabilityPART 49 Readability10 Developing a testing strategy11 Integrating unit testing into the organization12 Working with legacy codeAppendix Monkey-patching functions and modules