java

TDD & JUnit: Quality in Java

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

Expected Outcome

An efficient testing workflow making 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, the module demonstrates how tests drive design forward using Active Learning. JUnit 5 is used to create fast and clear unit tests that provide immediate feedback during development. A secure development environment is created where quality and speed go hand in hand for the entire team in daily operations. The module dives 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), dependencies are minimized and SOLID principles for testable architecture are adhered to. Test design challenges are addressed 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 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.

Tech Stack
JUnit 5 TDD Unit Testing Java 25 Java 21 Clean Code Quality
Andreas Olsson

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.

Connect on LinkedIn

Enterprise teams trained by Actlea

Academic Work
Handelsbanken
Scania
Swedbank
CGI
SEB
Participant Reviews

What past participants say

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

Related Training

spring boot Professional

RESTful APIs with Spring Boot

1 day
Group Rate: $2,900

Build and consume REST APIs with Spring Boot 4. Master @RestController, Spring Data JPA, and the modern RestClient through hands-on coding.

  • Spring @RestController & MVC
  • Spring Data JPA Persistence
  • Consuming APIs with RestClient
spring boot Foundational

Spring Boot Jumpstart: Essentials

1 day
Group Rate: $2,900

Build web APIs from scratch. Master Inversion of Control, type-safe architecture, and make your application cloud-ready with profiles and Actuator.

  • REST Controllers & Routing
  • Inversion of Control (IoC)
  • Dependency Injection (DI)
spring boot Professional

Mastering Spring Data & Persistence

1 day
Group Rate: $2,900

Learn to handle data effectively with Spring Data JPA. Master Repositories, entity mapping, and transactions in Spring Boot 4.

  • Spring Data JPA Repositories
  • Entity Mapping (@Entity)
  • Transactional Logic (@Transactional)
Take the next step

Ready to elevate your
Team's expertise?

Book a single workshop, a multi-day course, or a complete training package. The programs are built on proven standard modules of high technical quality, designed to be deployed immediately without lengthy preparation.

  • Expert-led training: Designed for professional development teams.
  • Standardized quality: Proven modules ready for immediate delivery.
  • Flexible formats: Execution is handled remote or onsite.

Send an inquiry to discuss availability and setup, completely without sales pressure.

Prefer connecting directly on LinkedIn? Skip the form:

Connect & Message on LinkedIn →