Pragmatic Unit Testing in Java with JUnit

Cover
Table of Contents
Foreword
	The More Things Change…
Acknowledgments
Preface
	Why Unit Testing
	Who This Book Is For
	What You Need
	How This Book Is Organized
	Code and Online Resources
	Test-Driven Development (TDD)
	Coding Style
Part I—Unit Testing Foundations
	1. Building Your First JUnit Test
		Reasons to Write a Unit Test
		Learning JUnit Basics: Your First Testing Challenge
		Writing a First Real Test
		Dealing with Failure
		Moving On to a One-Based Test: Something’s Happening!
		Increasing Your ROI: Cleaning Up Tests
		ZOM: Zero and One Done, Now Testing Many
		Covering Other Cases: Creating a Test List
		Congratulations!…But Don’t Stop Yet
	2. Testing the Building Blocks
		Units
		A Wee Bit Bigger Than a Unit?
		Concepts as Building Blocks
		Testing the Simpler Things
		Verifying Side Effects
		Testing Common Code Circumstances
		Exploring Boundaries with CORRECT
		Summary
	3. Using Test Doubles
		A Testing Challenge
		Replacing Troublesome Behavior with Stubs
		Changing Your Design to Support Testing
		Adding Smarts to Your Stub: Verifying Parameters
		Simplifying Testing Using a Mock Tool
		Injecting Mocks with Mockito
		Verifying a Method Was Called…or Not
		Testing Exception Handling
		Fast Tests
		A Mélange of Important Test Double Tips
		Summary
	4. Expanding Your Testing Horizons
		Improving Unit Testing Skills Using Code Coverage
		Testing Multithreaded Code
		Writing Integration Tests
		Exploratory Unit Testing
		Summary
Part II—Mastering JUnit with “E”s
	5. Examining Outcomes with Assertions
		Using the Core Assertion Forms
		Assertion Messages: Redundant Messages for Assertions
		Other Common JUnit Assertion Forms
		Expecting Exceptions
		Assert That Nothing Happened: assertDoesNotThrow
		Alternate Assertion Approaches
		Third-Party Assertion Libraries
		Eliminating Non-Tests
		Summary
	6. Establishing Organization in JUnit Tests
		The Parts of an Individual Test
		Setting Up and Tearing Down Using Lifecycle Methods
		Organizing Related Tests into Nested Classes
		Avoiding Dependency Despair: Don’t Order Your Tests!
		Executing Multiple Data Cases with Parameterized Tests
		Summary
	7. Executing JUnit Tests
		Testing Habits: What Tests to Run
		Creating Arbitrary Test Groups Using Tags
		Temporarily Disabling Tests with @Disabled
		Exploring More Features
		Summary
Part III—Increasing ROI: Unit Testing and Design
	8. Refactoring to Cleaner Code
		A Little Bit o’ Refactor
		Finding Better Homes for Your Methods
		Removing Temporaries of Little Value
		Amplifying the Core Intent of Code
		Are You Kidding Me? Addressing Concerns over Performance
		Final Cleanup
		Summary
	9. Refactoring Your Code’s Structure
		The Profile Class and the SRP
		Extracting a New Class
		Command-Query Separation
		The Costs of Maintaining Unit Tests
		Summary
	10. Streamlining Your Tests
		Tests as Documentation
		Searching for an Understanding
		Test Smell: Legacy Code Constructs
		Test Smell: Unnecessary Test Code
		Test Smells: Generalized and Stepwise Assertions
		Test Smell: Missing Abstractions
		Test Smell: Bloated Construction
		Test Smell: Multiple Assertions
		Test Smell: Irrelevant Details in a Test
		Test Smell: Misleading Organization
		Test Smell: Implicit Meaning
		Adding Tests from Your Test List
		Summary
Part IV—Bigger Topics Around Unit Testing
	11. Advancing with Test-Driven Development (TDD)
		The Primary Benefit of TDD
		Starting Simple
		Increment 1: Deferring Complexity
		Increment 2: Generalizing the Implementation
		Increment 3: Factoring Out Redundancies
		Increment 4: Introducing a Test Double
		Test-Driven Development vs. Test-After Development
		The Rhythm of TDD
		Summary
	12. Adopting Team Practices
		Coming up to Speed
		Getting on the Same Page with Your Team
		Practicing Continuous Integration
		Summary
	13. Keeping AI Honest with Unit Tests
		AI Isn’t Going Away
		Exploring a Simple Example with ChatGPT
		Establishing a Java Standard
		Providing Examples to ChatGPT
		Telling Your LLM to Clean Up Its Act
		Adding a New Feature: Suffixes
		Getting the LLM to Do Final Design Cleanup
		For Extra Credit
		Increasing Odds of Success with AI-Generated Code
		Will I Go Faster?
		Summary
Bibliography
Index
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