This interactive JUnit full course builds a solid foundation in unit testing for Java developers and testers. It includes interactive, hands-on sessions using JUnit 5 and Mockito to develop effective, isolated tests. Delivered by experts through live labs, it’s ideal for those new to unit testing.
Unit Testing with JUnit
Build confidence writing robust Java tests with practical real-world examples
Over three days, this instructor-led course equips developers and testers with practical JUnit 5 skills. You'll explore the core principles of unit testing and test-driven development, enabling you to write reliable, maintainable Java code, improve software quality, and enhance confidence in application performance.
Learning objectives
- Define unit testing principles
- Structure effective test cases
- Use JUnit annotations and assertions
- Run parameterised and conditional tests
- Implement stubs and mocks
- Use Mockito for behaviour testing
- Test DAOs, servlets, and IO methods
- Handle multi-threaded testing scenarios
- Apply test-driven development principles
What you’ll learn
Gain relevant experience with JUnit’s full feature set, including annotations, assertions, and mocking with Mockito. Learn how to write tests for complex Java applications, including IO, DAO, and multi-threaded code, and discover how TDD can improve software quality.
Unit testing principles
Gain a thorough understanding of what unit testing is, its role in producing reliable software, and why it is essential in the development lifecycle. You’ll explore how well-structured tests improve code quality, the importance of assertions in validating behaviour, and how coverage metrics measure effectiveness. This module also presents practical guidelines for writing maintainable tests that catch defects early, reduce technical debt, and improve long-term development efficiency.
JUnit 5 fundamentals
Establish a strong working knowledge of JUnit 5, from its core capabilities to the advantages of its modular architecture. You’ll see how the framework integrates smoothly with widely used IDEs and build tools, allowing you to make testing an effortless part of your workflow. The module also covers writing, organising and executing tests with annotations, assertions, and configuration options that strike the right balance between flexibility and control.
Assertions and assumptions
Develop confidence in applying JUnit’s comprehensive assertion and assumption features to make your tests more accurate and purposeful. You’ll explore tools like assertAll to group related checks, assertTimeout to validate performance thresholds, and conditional execution with assumeTrue or assumeFalse. By mastering these techniques, you’ll write focused tests that clearly express intent, highlight the right issues, and avoid unnecessary failures that can slow development progress.
What’s included
- Three days of live virtual instruction
- Real-time coding in live labs
- Hands-on practice with JUnit and Mockito
- Digital course manual and resources
- Certificate of attendance
Key facts
Ideal for
Java developers and testers wanting to write maintainable, testable code, and improve software quality.
Prerequisites
Basic Java programming experience is required. Familiarity with object-oriented concepts and APIs like Collections, IO, or JDBC is also recommended.
Learning experience
Our experienced trainers and interactive labs create a focused, practical environment – so you can put theory into practice from day one.
FAQs
This course provides a complete introduction to unit testing in Java using JUnit and Mockito. You’ll develop test-first thinking and learn how to write clean, isolated tests for complex Java applications.
Does this course use JUnit 5, and how is this different from earlier versions?
Yes. This course is delivered using JUnit 5 (JUnit Jupiter), which features a modern, modular design. It supports Java 8 capabilities such as lambda expressions, introduces improved annotations, and offers more flexible, granular control over tests, compared to earlier versions.
Do I need prior experience with JUnit before attending this course?
No prior experience with JUnit is needed. However, you should be familiar with Java programming and comfortable building simple applications. If you’re new to Java, we recommend completing our Java Programming 1 course first to ensure you have the foundation needed for this training.
What is test-driven development (TDD) and why should I use it?
TDD is a development method where tests are written before the code, guiding design and improving quality. It follows the Red-Green-Refactor cycle to ensure clean, reliable code and reduce bugs. In this course, you’ll learn TDD principles hands-on, applying them with JUnit 5 to produce maintainable Java applications.
Can I get hands-on experience if I attend this course remotely?
Yes. You’ll take part in guided exercises using live labs throughout the course. Expert instructors guide you in real time, ensuring you build genuine coding skills while receiving direct support and feedback.
What our customers say
“John was very knowledgeable about the subject and clearly explained everything.”
Kimberley, Community Risk Reduction IT Systems – Fire
"Alan is a wonderful lecturer and is an expert within the field. He has a great pace, allowing me and the rest of the group to work on practical exercises after learning a new topic to consolidate the learning and ask any questions. I really enjoyed the course and looking forward to learning more from Alan for future courses at StayAhead.”
Abdulmalik, Trainee Software Engineer - Government
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Courses are delivered by experienced instructors using hands-on, practical live labs