Unit Testing Essentials using JUnit 5 and Mockito (with Best Practices)

Course Objectives

This skills-centric course is about 50% hands-on lab and 50% lecture, designed to train attendees in core unit testing skills, coupling the most current, effective techniques with the soundest industry practices. Working in a hands-on learning environment, guided by our expert team, attendees will learn to:

• Understand what unit testing is and what it is not intended to cover
• Understand JUnit 5.
• Understand and use the JUnit Test Runner interface.
• Use JUnit to drive the implementation of Java code.
• Test applications using native IDE support.
• Best practices and patterns for unit testing.
• Understand JUnit’s strengths and weaknesses
• Understand the role of debugging when done in conjunction with tests.
• Understand not only the fundamentals of the TDD using Java, but also its importance, uses, strengths and weaknesses.
• Understand how JUnit affects your perspective on development and increases your focus on a task.
• Learn good JUnit coding style.
• Create well-structured JUnit programs.
• Understand how JUnit testing can be used for either state-based or interaction-based testing.
• How to extend testing with mock objects using Mockito.
• Look at refactoring techniques available to make code as reusable/robust as possible.
• Discuss various testing techniques.

The following JUnit-based testing frameworks are examined:

• JUnit 5
• Mockito
• PowerMock

Need different skills or topics?  If your team requires different topics or tools, additional skills or custom approach, this course may be further adjusted to accommodate.  We offer additional unit testing, TDD, BDD, programming, testing tools, test automation, QA, services, security and other related topics that may be blended with this course for a track that best suits your needs. Our team will collaborate with you to understand your needs and will target the course to focus on your specific learning objectives and goals.

Course Prerequisites

This programming course is for experienced Java developers.

Please see the Related Courses tab for specific Pre-Requisite courses, Related Courses that offer similar skills or topics, and next-step Learning Path recommendations.

Course Agenda

Please note that this list of topics is based on our standard course offering, evolved from typical industry uses and trends. We’ll work with you to tune this course and level of coverage to target the skills you need most.

Session: Unit Testing using JUnit

Lesson: Unit Testing Fundamentals

• Purpose of Unit Testing
• Good Unit Tests
• Test Stages
• Unit Testing Vs Integration Testing
• Understanding Unit Testing Frameworks

Lesson: Jumpstart: JUnit 5.x

• Understand and work with the features of JUnit
• Write unit tests using @Test annotation
• Use @DisplayName to specify a custom name for the test
• Manage fixtures using @BeforeEach, @AfterEach, @BeforeAll and @AfterAll annotations
• Launch tests using @ExtendWith (@RunWith – JUnit 4+) annotation
• Build test suites using @SelectPackages or @SelectClasses
• Use @Disabled to prevent a test class or method from running
• Lab: Demo JUnit
• Lab: Build JUnit Case Study
• Lab: Jumpstart JUnit
• Lab: Reapplying JUnit

Lesson: Annotations

• Describe the test execution cycle
• Check for exceptions thrown by test
• Use timeouts to fail test that take longer than required
• Lab: Working with @Test Annotation

Lesson: Hamcrest

• Learn the notation of assertThat
• Know the objective of Hamcrest library
• Use Hamcrest's logical and object matchers
• Use Hamcrest's number and collection matchers
• Lab: Working with Hamcrest

Lesson: Parameterized Tests

• The @ParameterizedTest annotation
• A parameterized test to test code under several conditions
• Generic tests to support parameterized testing
• Lab: Working with Parameterized Tests

Lesson: Advanced Features

• Nested Unit Tests
• Repeated Tests
• JUnit Extensions
• Conditions
• Lambda Support
• Grouped Assertions
• Lab: Working with  Advanced Features

Lesson: JUnit Best Practices

• "Good" Tests
• Bad Smell
• White-Box Unit Testing
• Black-Box Unit Testing
• Automation and Coverage

Session: Advanced Topics

Lesson: Mocking of Components

• Why We use Test Dummies
• Mock Objects
• Working with Mock Objects
• Using Mocks with the User Interface
• Mock Object Strategies

Lesson: Mock Objects and Mockito

• Mockito Description and Features
• Mockito Object Lifecycle
• Create/Expect Phase
• Replay/Verify Phase
• Mocking Complex Objects
• Lab: Mock Objects and Mockito
• Lab: Injection

Lesson: Improving Code Quality Through Refactoring

• Refactoring Overview
• Refactoring and Testing
• Refactoring to Design Patterns
• Naming conventions
• Lab: Refactoring
• Lab: Best Practices - Refactoring Tests

Session: Appendix

Lesson: Adding Testing to the Build Process

• JUnit and Ant
• The Ant JUnit Tag
• Running JUnit Tests from Ant
• Generating a JUnitReport

Course Materials

Student Materials: Each participant will receive a Student Guide with course notes, code samples, software tutorials, step-by-step written lab instructions, diagrams and related reference materials and resource links. Students will also receive the project files (or code, if applicable) and solutions required for the hands-on work.

Hands-On Setup Made Simple! Our dedicated tech team will work with you to ensure our ‘easy-access’ cloud-based course environment is accessible, fully-tested and verified as ready to go well in advance of the course start date, ensuring a smooth start to class and effective learning experience for all participants. Please inquire for details and options.

Ways To Learn with Flexible Hours & EveryCourse Extras!

• Attend a Class! For your convenience, this course is available on our online-live Public Schedule in full day format, or flexible hours half-day Mini-Camp short course sessions in AM or PM hours. Please see the current scheduled dates listed below.  Please ask if you don't see a date you'd prefer. Be also be sure to check out our current Special Offers for extra savings.
• Team Training! We're also happy to deliver this as a private event for your team or organization, tailored to suit your needs.
• Trivera's Every-Course Extras bring High-Value & Long Term Learning Support! All courses also include our unique EveryCourse Extras package (Post-Course Resource Site access with Review Labs & Live Instructor Follow-on Support, access to QuickSkills recorded High-Value lessons, Free *Live* Course Refresh Re-Takes, early access to Special Offers, Free Courses & more). Please inquire for details.