Improve your approach to Java unit testing using JUnit 5, Mockito and test-driven development during this course. You'll focus on writing clear, reliable tests that support cleaner code, faster fault detection and more controlled change. Through practical coding exercises, you’ll also build testing techniques that can be applied directly in development environments, helping you improve release confidence and contribute to higher-quality Java applications.
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Unit Testing with JUnit
Java testing skills for development teams
This three-day live virtual classroom course is for Java developers and software testers who need a stronger working approach to unit testing. You will practice using JUnit 5 and Mockito to write focused tests, manage dependencies and check Java code with greater control. The course is ideal if you are looking to develop your first structured unit testing skills or consolidate existing experience. It also supports your progression into roles where test automation, code quality and reliable delivery are central to day-to-day development.
Learning objectives
- Explain unit testing principles
- Write JUnit 5 tests
- Use JUnit annotations
- Apply assertions and assumptions
- Create parameterised tests
- Configure conditional tests
- Manage test doubles
- Use Mockito with confidence
- Test complex Java code
- Apply TDD techniques
Key facts
Certification
This is a skills and knowledge-based course without formal accreditation.
Who it’s for
Ideal for software testers and Java developers who are new to JUnit or unit testing and want to build practical testing skills
Prerequisites
A working knowledge of Java is required. Familiarity with commonly used APIs such as Collections, IO and JDBC will be beneficial
Exam information
No exam is included.
Optional extras
There are no optional extras with this course.
Pre-course
No formal pre-course work is required.
FAQs
This three-day live virtual classroom course helps Java professionals build a structured approach to unit testing using JUnit 5, Mockito and TDD. It focuses on writing focused tests, managing dependencies and applying testing techniques that support safer code changes, clearer feedback and stronger development practices.
Who is this course designed for?
This course is suited to Java developers, software testers, software engineers, test automation engineers and SDETs who work with Java applications. It is particularly relevant if you need to write or maintain automated unit tests, support test automation activity or strengthen the way your team checks code during development.
Do I need previous JUnit experience?
No previous JUnit experience is required. The course is suitable if you are building structured unit testing skills for the first time or want to consolidate existing knowledge. You should have a working understanding of Java, as you will practice unit testing techniques within Java development contexts throughout the course.
What will I be able to do after the course?
During the three days, you’ll have practiced writing JUnit 5 tests, applying assertions and assumptions, using parameterised and conditional testing, working with Mockito and approaching more complex Java testing scenarios. Which will have equipped you with the skills to create tests that give clearer feedback, reduce avoidable manual checking and support more controlled code changes.
How does Mockito support unit testing?
Mockito helps you test Java code where dependencies make direct testing difficult. On the course, you will practice using test doubles such as mocks, stubs and spies to control interactions and check behaviour, helping you focus on the code being tested without relying on every surrounding component being available or predictable.
How does TDD fit into this course?
The course introduces TDD through the Red-Green-Refactor cycle. You will use this approach to define expected behaviour before implementation, then improve the code while keeping tests in place as feedback. This helps make design decisions more visible and gives developers a practical method for shaping code incrementally.
Is the course useful for Agile teams?
Yes. The skills covered are relevant to Agile teams because unit tests and TDD can support faster feedback during development. The course focuses on practices that help teams check behaviour earlier, work with changing requirements and reduce the amount of rework caused by defects found late in the delivery process.
Are live labs included in the course?
Yes. Live labs are included as part of the course, giving you structured coding practice while you learn. You will work through guided exercises using JUnit 5, Mockito and TDD, helping you apply each technique in a practical Java testing context and build skills you can use back in development or test automation work.
What our customers say
“I really enjoyed this course. It was clear the instructor had in-depth knowledge about the subject and was keen on answering questions / explaining problems thoroughly. I also appreciated learning about the principles, best practice standards, and the reasoning behind these.”
Michaela, Data Scientist - Government
“The training was absolutely fantastic. Hats off to the trainer John.”
Jomon, Senior Specialist Engineer SRE - Government
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