Unit Testing Basics

• What is Unit Testing?
• What is JUnit?
• Introducing a Simple Unit Test in JUnit
• Structure of a Unit Test (Arrange-Act-Assert and Given/When/Then)
• Conventions for Writing Unit Tests
• Characteristics of Proper Unit Tests
• What are Assertions?

Creating a Java Project Using JUnit

• Creating a Java Project Using the Maven Quickstart Archetype in JUnit
• Introducing a Typical Java Project Structure (Production vs Test Source Trees)
• Understanding the Basic Conventions for Creating Unit Tests (Package and Naming)

Writing and Running Unit Tests with JUnit and IntelliJ IDEA

• Creating a Test Method with @Test Annotation
• Running a Unit Test Within the Integrated Development Environment (IDE) and Understanding Test Success
• Understanding Test Failures with Exceptions
• Failing a Unit Test Explicitly with Assert.Fail()
• Using Assert.Fail() to Check Validation Logic in a Try/Catch
• Introduction to the JUnit Assertions API
• Structuring Unit Tests with Arrange-Act Assert
• Understanding the Execution of Assertions and JUnit's Fail-fast Test Failure Mechanism
• Adding Descriptive Comments to Assertions and Test Failures to Aid Diagnostics
• Coding a Unit Test Following Arrange-Act-Assert
• Keeping Test Setup (Don't Repeat Yourself) DRY with @Before
• Understanding Test Fixture Instantiation

Using Testing with Mock Objects and Mockito

• What Is Mockito and What Are Mock Objects?
• Introduction to Testing with Mock Objects
• Configuring Projects Using Mockito
• Creating a Project Which Uses JUnit and Mockito
• Coding a Layered Architecture - Presentation Layer
• Coding a Layered Architecture - Business Layer
• Coding a Layered Architecture - Persistence Layer
• Putting the Correct Packages in Place to Respect the layering
• Writing a Test for the Login Controller in the Presentation Layer
• Understanding the Test Fixture Setup While Writing Mock Object-based Unit Tests
• Writing a Test for the Authentication Service in the Business Layer
• Thinking about Design Decisions When Unit Testing

Hamcrest Assertions Library

• Evolving the Domain and Repository Classes
• Ignoring Tests with @ignore
• Implementing a Finder in the Repository
• Implementing Business Logic in the Service
• Configuring Maven to Use Java 8
• Evolving the Repository Class
• Adding a Parameter-driven Finder to the Service
• Refactoring to Evolve a New Service
• Generating Test Methods in the IDE and Toggling Between Production and Test Code
• Introducing the JUnit Mockito Runner and @Mock
• Analyzing the Production Code to Determine How to Write the Arrange Section
• Using Mockito's @InjectMocks to Create the System Under Test with its Dependencies
• Keep Yourself Motivated by Checking the Happy Path Test Output
• Using the JUnit Assertions API to Write the Assert Section
• Thinking about the Weaknesses of the JUnit Assertions API
• Importance of Checking Your Work as You Go!
• Upgrading a JUnit Project to Use the Full Hamcrest Version
• Replacing JUnit Assertions with Hamcrest Assertions and Using Assertions with Collections
• Understanding and Reading Hamcrest Test Failures
• Quick Thoughts on Hamcrest Individual vs Collection Assertions
• Do Not Invoke Unneeded Production Code in Your Test Classes
• Understanding Evaluation of Hamcrest Matchers
• Thinking about Keeping Production Code to a Minimum in Tests
• Creating Complex Hamcrest Assertions with allOf Method and Property Matchers

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