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Java Testing with JUnit 5

JUnit 5 is substantively different than JUnit 4. Although the core testing principles are the same, there are substantial implementation differences, important new features, and a brand new extension...

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Course Code JAV-312
Duration 2 days
Available Formats Classroom

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JUnit 5 is substantively different than JUnit 4. Although the core testing principles are the same, there are substantial implementation differences, important new features, and a brand new extension model.

Accelebrate's Java Testing with JUnit 5 teaches experienced Java developers the fundamentals of unit testing using JUnit 5 and Mockito libraries. Attendees learn how to test enterprise components in the persistence, service, and web layers. Best practices are emphasized and demonstrated throughout this course.

Skills Gained

  • Understand the new JUnit 5 library structure, role of each component, and how they interact
  • Configure IDE projects to run tests natively, and via Maven Surefire
  • Write cohesive and effective tests and design classes for testability
  • Understand the full test lifecycle, and employ it to configure test fixtures
  • Run tests using all available mechanisms: IDE, Maven, JUnit Console Launcher, Launcher API
  • Use test discovery and filtering to define and run test plans, including conditional test execution
  • Employ naming conventions at every level - test name, classname, display name
  • Organize tests with assertion groups and nested tests
  • Use test interfaces to apply good OO principles to testing
  • Understand the new JUnit extension model, and how to write and use them
  • Understand JUnit 4 compatibility and migration
  • Use mock objects with Mockito to support isolated testing
  • Explore Mockito's facilities for dependency injection of mocks
  • Use argument matchers for more generalized testing with mocks
  • Implement partial mocking with spies
  • Understand the issues in testing enterprise components
  • Understand the two basic approaches: standalone testing with mocks, and in-container testing
  • Test database access components, using both fakes and an embedded database
  • Understand the additional issues involved in testing

Prerequisites

All students must have a good working knowledge of Java and OO, including the use of interfaces, abstract classes, collections, factories, and generics. Experience with Java 8 lambda expressions is helpful, but not required.

Course Details

Training Materials

All JUnit 5 training students receive comprehensive courseware.

Software Requirements

  • A recent version of Windows, macOS, or Linux with at least 8 GB RAM
  • JDK 8 or later
  • Eclipse or IntelliJ IDEA
  • Other free software - please contact us if you have purchased this class

Outline

  • Introduction
  • Unit Testing with JUnit 5
    • Overview
      • Unit Testing and JUnit Overview
      • New Features in JUnit 5
      • JUnit 5 Library Components
      • Naming Conventions and Organizing Tests
    • Tests and Assertions
      • Writing Test Methods
      • Assertions
      • Assertion Messages
    • Test Fixtures and Test Lifecycle
      • Creating and Using Text Fixtures
      • Test Run Lifecycle: @BeforeEach and @AfterEach, @BeforeAll and @AfterAll
      • Controlling Test Instances
  • Writing and Running Tests (includes a brief primer on Java 8 new features)
    • Additional Testing Needs
      • Testing for Exceptions
      • Setting Timeouts
      • Assertion Groups
    • Running Test
      • IDE Support: Eclipse, IntelliJ IDEA
      • Maven Configuration
      • JUnit Platform Console Launcher
      • Launcher API
      • Test Discovery and Selection
      • Display Names
      • Grouping and Filtering with Tags
      • Configuration Parameters
      • Nested Tests
    • Advanced Capabilities
      • Custom Composed Annotations
      • Inheritance with Test Classes
      • Extensions
      • Conditional Test Execution
      • Parameterized Tests
    • JUnit 4 Migration
      • The Do-Nothing Case
      • Using a JUnit 4 Runner
      • API Changes
      • JUnit 4 Runners and Rules
      • JUnit 4 Test Suites
    • Best Practices
      • Testing Void and Private Methods
      • Test Cohesion and Assertion Scope
      • Characteristics of Good Tests
      • Writing Testable Code
      • Testing Anti-Patterns
  • Testing with Mocks
    • Overview
      • Mock Objects as Collaborators
      • Mockito Overview
    • Creating and Using Mocks
      • Basic Steps in Mocking
      • The Mockito Class
      • Mock Creation with @Mock
      • JUnit 5 MockitoExtension
      • Stubbing
    • Additional Capabilities
      • Argument Matchers
      • Partial Mocking with Spies
      • Mocking the Unmockable
      • Dependency Injection of Mocks
  • Testing Enterprise Components
    • Overview
      • Unit Testing vs. Integration Testing
      • Testing with Mocks vs. In-Container Testing
      • Mocks vs. Fakes
    • Testing the Persistence Layer
      • Database Options: Installed, Embedded, Embedded-in-Memory
      • Standalone vs. In-Container Testing
      • Test Independence and Transaction Rollback
      • In-Container Testing with Arquillian [Overview]
    • Testing Services
      • Similar Issues, Different Layer
      • Working with External Resources
      • The Argument for In-Container Testing
    • Testing Web Components
      • Interfacing with External Clients
      • Difficulties in Standalone Testing with Mocks
      • Manual vs. Automated Testing
      • Automated Testing with Selenium [Overview]
  • Conclusion
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