java

TDD & JUnit: Quality in Java

Secure your code quality by mastering TDD and JUnit 5 for modern Java applications.

Expected Outcome

Gain an efficient testing workflow making your code more stable and easier to maintain.

Target Audience

For teams wanting to minimize bugs and create a sustainable test strategy in modern Java.

Prerequisites

Java experience is required, but no prior knowledge of unit testing or JUnit is expected.

Curriculum & Highlights

→ JUnit 5 Core & Assertions

→ TDD: Red-Green-Refactor

→ Structuring Test Classes

→ Isolating Dependencies

→ Design for Testability

→ Test Lifecycle & Hooks

→ Java 21 & 25 Test Patterns

Challenges we address

"How do you set up and structure effective unit tests with JUnit 5?"

"How do you use Red-Green-Refactor to let tests drive the design of your code?"

"What are the best ways to write tests that are easy to understand and maintain?"

Detailed Description

Poor test coverage often leads to expensive regressions and a fear of changing existing code, stifling innovation and slowing down projects. Testability is not just an afterthought—it is a measure of good architecture and requires a specific methodology to be successful in complex Enterprise systems. Through the Red-Green-Refactor cycle, I teach how tests drive design forward using Active Learning. We use JUnit 5 to create fast and clear unit tests that provide immediate feedback during development. We create a secure development environment where quality and speed go hand in hand for the entire team in your daily work. We dive deep into the JUnit 5 Jupiter API to structure test suites that are easy to maintain and serve as living documentation. By implementing isolated unit tests with Mockito and mastering lifecycle methods (Hooks), we minimize dependencies and adhere to SOLID principles for testable architecture. We address test design challenges by letting tests drive code development, ensuring every logic flow is verified and prepared for future refactoring in modern Java 21 and 25. Actlea's core philosophy is that testability is the most reliable indicator of sound architectural health. Experience demonstrates that TDD is not merely about finding bugs, but about enforcing a modular and loosely coupled design ready for rapid change in 2026. By securing quality at this level, a sense of confidence is built into the codebase that is absolutely essential for the team to maintain a high pace of innovation without being dragged down by expensive regressions.

Recommendation & Next Steps

Once quality is secured through robust testing, the next logical step is to modernize the team's syntax in the 'Modern Java Fast-Track' workshop. →

Format Workshop

Duration 1 day

Level Professional

Instructor Andreas Olsson

Price per group $2,900

Standard price per group (up to 12 participants) for remote delivery. Additional costs apply for onsite delivery.

Get Quote & Book Download Overview (PDF)

Tech Stack

JUnit 5 TDD Unit Testing Java 25 Java 21 Clean Code Quality

Your Instructor

Andreas Olsson

Expertise through Active Learning

Java and the Spring Framework have been my core focus for over 20 years. Today, my mission is primarily to help organizations step into the future by integrating intelligent agents and AI-driven features into modern Java systems.

Actlea stands for Active Learning – the philosophy that programming is best learned by writing code, not by watching slides. My workshops focus on intensive, hands-on exercises designed to solve real-world problems.

I deliver proven training concepts globally across all timezones. While I specialize in remote delivery, I love to travel for onsite workshops. My modules are ready for immediate impact but can be tailored to your team's specific requirements.

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Java • Spring Boot • Spring AI

Enterprise teams trained by Actlea

Participant Reviews

What past participants say

Read about the pedagogical approach, the hands-on labs, and the impact on daily work.

"Andreas is a fantastic teacher! In addition to the fact that I experienced him as competent with a solid knowledge of his subjects, he really excels as an educator. Regardless of who you are or what level of knowledge you are at, Andreas always responds to one's questions with commitment, curiosity and a positive attitude that is contagious. Above all, I appreciated that he both gave me space to explore solutions myself and think creatively, while he was always there to contribute his support. I highly recommend Andreas!"

"The Java program at Academic Work was excellent! It consisted of, given the name, mostly programming in Java, but also had some front-end courses. I thought the Java courses were the best. Not only because I was most interested in java, but also because the teacher in the java courses was Andreas. It's easy for it to get messy and "too much" when learning programming, especially for those starting from scratch, but Andreas taught in a very pedagogical way, and it never became long-winded or boring. Recommends the java program at Academic Work to anyone who wants to learn programming and wants to change careers."

"Andreas is the name of competence, skill and reliability. He is no doubt a guru in the field of Java. His style of teaching is practical, well structured and effortless; I learned Java by doing it because of his well organized assignments.I felt connected, confident and comfortable with Andreas during the whole course because he listens, replies and helps each and every student in a very productive and professional way"

"A fantastic trainer who managed to keep a good and clear structure in an intensive course with a high pace. Andreas is very good at conveying his experience and practical know-how in a way that was engaging and easy to understand. With a structure focused around practical exercises, the training was not only very educational but also incredibly fun."

"During the 12-week intensive training in Java at Academy, Andreas trained me primarily in Spring Boot and the connection between databases and web applications via JDBC and JPA. Andreas showed advanced competence in the field, patience and good teaching ability."

"I had the honor of having Andreas as a teacher during a 12 week Java program for Brights. During these weeks we learned the basics of Java but also more advanced Java. Would really recommend Andreas for the great competence he possesses but also for his patience. He always answered the questions that we students had and was very patient when required. Andreas always has a smile on his face and he is passionate about teaching, which you can clearly see. I always felt safe talking to Andreas when I needed help and he was always there to support. He is simply one of the best teachers I have ever had!"

"Andreas is an excellent teacher who shows great competence in system development with Java and has developed an effective and engaging curriculum. He is an experienced system developer with broad knowledge of the Java ecosystem and he provides valuable feedback that helps students grow and develop as programmers. Andreas also encourages independent and creative thinking for students. I highly recommend Andreas to anyone looking for a high-quality education in Java development."

"In all my years at school, I have never met a teacher who treated his students with as much patience and joy as Andreas did. His commitment to us felt very genuine, and it was clear that he was the right person in the right place. I am very glad we had him as a teacher during our 12 weeks at Brights."

"During my Java training, I have had the privilege of having Andreas as a teacher. Throughout the training, Andreas has been very pedagogical and makes sure that every student follows along in the training, regardless of what previous experience they have. Thanks to his broad competence in Java, the training has been very educational and engaging."

"I thought it would be almost impossible to learn everything that was going to be covered in the three months we had. But Andreas broke it all down and explained in such a way that you understood and adjusted the pace of the training while making sure that all subjects were covered. It is obvious that he has a lot of knowledge and enjoys teaching."

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