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Test-Driven Development in Java

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Getting Started

Introduction and Prerequisites

Building the Case for TDD

Introduction: Building the Case for TDD Writing Code Badly Recognizing Bad Code Decreasing Team Performance Diminishing Business Outcomes Summary and Quiz: Building the Case for TDD

Using TDD to Create Good Code

Introduction: Using TDD to Create Good Code Designing Good Quality Code Revealing Design Flaws Preventing Logic Flaws Avoiding Future Defects and Documenting Codes Summary and Quiz: Using TDD to Create Good Code

Dispelling Common Myths about TDD

Introduction: Dispelling Common Myths About TDD Writing Tests Slows Me Down Tests Cannot Prevent Every Bug How Do You Know the Tests Are Right?TDD Guarantees Good Code Our Code Is Too Complex to Test We Don’t Know What to Test Until We Write the Code Summary and Quiz: Dispelling Common Myths About TDD

Building an Application Using TDD

Introduction: Building an Application Using TDD Introducing the Wordz Application Exploring Agile Methods Summary and Quiz: Building an Application Using TDD

Writing Our First Test

Introduction: Writing Our First Test Starting TDD: Arrange-Act-Assert Defining a Good Test Catching Common Errors and Asserting Exceptions Preserving Encapsulation Finding Design Flaws with Unit Testing Beginning Wordz Exercise: Extending Wordz Solution: Extending Wordz Summary and Quiz: Writing Our First Test Challenge: Basic String Manipulation Solution: Basic String Manipulation

Following the Rhythms of TDD

Introduction: Following the Rhythms of TDD Following the Red-Green-Refactor Cycle Writing Our Next Tests for Wordz Advancing the Design With Two-letter Combinations Summary and Quiz: Following the Rhythms of TDD Exercise: Email Address Validator Solution Email Address Validator Challenge: FizzBuzz Solution: FizzBuzz

Driving Design—TDD and SOLID

Introduction: Driving Design—TDD and SOLID Test Design with SOLID Principles Simplifying Maintenance with SRP Implementing DIP for Enhanced Flexibility Understanding LSP in OOP Implementing OCP in OOP Effective Interface with ISP Summary and Quiz: Driving Design—TDD and SOLID Exercise: Transforming Shape Area Calculation Solution: Transforming Shape Area Calculation Challenge: Pig Latin Solution: Pig Latin

Test Doubles—Stubs and Mocks

Introduction: Test Doubles—Stubs and Mocks

Testing Challenges in Collaborative Software Development

Mastering Test Challenges with Test Doubles and SOLID Principles

Using Stubs for Controlled Testing

Exploring Mock Objects in Testing

Understanding When Test Doubles Are Appropriate

Automating Test Doubles with Mockito

Mockito for Efficient Test Double Creation

Testing Exception Handling with Mockito

Testing an Error Condition in Wordz

Summary and Quiz: Test Doubles—Stubs and Mocks

Challenge: Grade System—Stubs and Mocks

Solution: Grade System—Stubs and Mocks

Hexagonal Architecture—Decoupling External Systems

Introduction: Hexagonal Architecture—Decoupling External Systems Challenges of External Systems Enhancing Testability and Maintainability Through SOLID Principle Abstracting External Systems in Hexagonal Architecture Crafting the Domain Model Efficient Testing with FIRST Unit Tests in Hexagonal Architecture Abstracting the Database Using Hexagonal Architecture Summary and Quiz: Hexagonal Architecture—Decoupling External System Challenge: Hexagonal Architecture for CRUD Operations Solution: Hexagonal Architecture for CRUD Operations

FIRST Tests and the Test Pyramid

Introduction: FIRST Tests and the Test Pyramid Test Pyramid: A Structured Approach to Effective Testing Integration Tests in Test Pyramid Understanding End-to-End and User Acceptance Tests CI/CD Pipelines for Optimizing Software Development Workflow CI/CD Pipelines and Test Environments in Production Integration Testing in Wordz Summary and Quiz: FIRST Tests and the Test Pyramid

Exploring TDD with Quality Assurance

Introduction: Exploring TDD with Quality Assurance Exploring TDD’s Role in Software Quality Assurance Manual Exploratory Testing—Discovering the Unexpected Balancing Automation and Human Review Crafting User-Centric Interfaces by UI and UX Testing Development Through Secure Operations and Balanced Practices Summary and Quiz: Exploring TDD with Quality Assurance

Test First, Test Later, Test Never

Introduction: Test First, Test Later, Test Never Adding Tests First Risks Associated with Delayed Testing in TDD Consequences of Avoiding Test Automation Inside-Out vs. Outside-In Testing in TDD Mastering Test Strategies with Hexagonal Architecture Summary and Quiz: Test First, Test Later, Test Never

Driving the Domain Layer

Introduction: Driving the Domain Layer Initiating a New Wordz Game Instance Tracking the Progress of the Wordz Game Triangulating Word Selection in Wordz Using Mock Setup Asserting Word Selection and Refactoring Using Mock Setup Designing the Gameplay Interface for Wordz Triangulating Game Progress Tracking by Refactoring Handling Guesses, Attempts, and Game Over Conditions Wordz Design Evaluation and Optimization Summary and Quiz: Driving the Domain Layer Challenge: PigLatin Game Domain Layer Solution: PigLatin Game Domain Layer

Driving the Database Layer

Introduction: Driving the Database Layer Database Integration Test with DBRider Production Code for Database Integration Test Building WordRepository and GameRepository Adapters Summary and Quiz: Driving the Database Layer

Driving the Web Layer

Introduction: Driving the Web Layer Configuring and Testing HTTP Endpoints Building HTTP Server for Wordz Application Streamlining Game Initialization in Wordz Managing Game Start Errors in Wordz Handling Multiple Guesses in the Wordz Gameplay Integrating Core Components of Wordz Application Navigating Wordz Game with Microservice Architecture Summary and Quiz: Driving the Web Layer

Wrap Up

Takeaways and Future Directions

Appendix

Technical Requirements

Introduction: Test Doubles—Stubs and Mocks

Get an introduction to what you’ll learn in this chapter.

We'll cover the following

Test doubles
Chapter goals

In this chapter, we’re going to solve a common testing challenge.

How can we test an object that depends on another object? What do we do if that collaborator is difficult to set up with test data?

Several techniques are available to help us with this and they build on the SOLID principles we learned previously. We can use the idea of dependency injection to enable us to replace collaborating objects with ones specially written to help us write our test.

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