Testing is one of those things that separates hobbyist code from production software. Anyone can write code that works on a good day. Professional developers write code that keeps working as the project grows, as requirements change, and as other people add features that might break things. This course teaches you the testing frameworks and methodologies that make that possible—JUnit 5 for the foundation, Mockito and PowerMock for handling dependencies, and the development approaches that put testing at the center of how you build software.

This Course Offers

• JUnit 5 from the ground up: You're learning the modern standard for Java testing—how to write assertions, structure test classes, use parameterized tests, and organize test suites in ways that scale with your project.
• Mocking with Mockito and PowerMock: Real applications have databases, APIs, and external services you can't control in tests. You're learning how to mock those dependencies, verify interactions, and test edge cases that would be impossible to trigger in production.
• Test-Driven Development in practice: Instead of treating TDD as a theoretical concept, you're working through examples where tests are written first, guiding the design of cleaner, more testable code from the beginning.
• BDD and ATTD approaches: Beyond unit tests, you're learning how Behavior-Driven Development shifts the conversation toward business outcomes, and how Acceptance Test-Driven Development keeps features aligned with what stakeholders actually need.

Why We Love This Course

1. The instructor is a working consultant, not just a teacher: Andrii Piatakha brings real-world experience from client work, which means the examples and patterns reflect what actually happens in professional development shops.
2. Source code access changes how you learn: Having the complete code for examples and solutions means you can experiment, break things, and see how they work—not just watch someone else type.
3. The mobile app for interview prep is a genuine differentiator: Testing knowledge is one thing; being able to pass tests in interviews is another. The included app with hundreds of practice questions bridges that gap.
4. The Q&A support is actually responsive: When you're stuck on a mocking scenario or a tricky test case, having actual instructor support matters more than watching another video of someone whose code works perfectly.

Production code without tests is just speculation. The question is whether you want to keep writing code that might work or join the developers who can prove their code works, document their assumptions, and sleep soundly after deployments. This course comes with a money-back guarantee if it's not clicking, so there's real room to see if professional testing practices change how you think about building software.

• Junior Java developers who want to write code that doesn't break when someone else touches it
• Experienced Java developers who've gotten by with minimal testing and know it's time to level up
• Future Java developers preparing for interviews where testing knowledge will be expected
• Developers joining teams that practice TDD who need to get up to speed quickly
• Anyone who's ever deployed code and crossed their fingers hoping nothing broke in production
• Students who've learned Java syntax but not yet learned how to build reliable, maintainable software
• Engineers preparing for roles where code quality and testing discipline are part of the culture

• Knowledge of Java basics is required—passing the instructor's "Master Java Basics" and OOP courses should be enough preparation.
• A computer with internet access to set up your development environment.
• Willingness to write tests, not just watch videos about writing tests.
• Curiosity about why testing matters beyond just "it's good practice."

Interested in exploring more business lessons? Check out our full course library to continue building your skills and advancing your learning journey.