Test Java Applications with JUnit, Mockito, and Beyond
Automated testing is not optional in professional Java development — it is what separates code that survives production from code that breaks silently. This track covers the full testing stack: unit tests with JUnit, dependency isolation with Mockito, integration tests against real Spring Boot services, and test automation wired into a CI/CD pipeline. Twelve focused courses take you from writing your first assertion to validating an entire system end to end.
What You Will Learn
You will write unit tests with JUnit and progress to its advanced features for robust test design. Mockito teaches you to mock dependencies cleanly, then apply flexible mocking and complex mocking patterns as your code grows. You will practise the Test-Driven Development (TDD) workflow and explore Behavior-Driven Development (BDD) with Gherkin for readable, stakeholder-friendly specs. Integration testing moves from basic multi-layer validation up to Spring Boot web service tests. The track closes with performance and security testing fundamentals and connecting your test suite to a CI/CD pipeline for continuous automated verification.
The Learning Path
Twelve courses span A1 to C1. The track opens at A1 with JUnit Fundamentals: Your First Unit Tests, then steps through B1 and B2 with Mockito introduction, TDD workflow, advanced Mockito usage, integration testing basics, and BDD with Gherkin. The C1 tier covers the most demanding material: Spring Boot Integration Testing: Web Services, Advanced Mocking Patterns: Complex Scenarios, End-to-End Testing Strategies: Full System Validation, Performance & Security Testing Fundamentals, and finally Test Automation & CI/CD Integration.
How It Works
Each course is split into short, hands-on lessons you complete in the built-in code editor with real-time feedback. When you get stuck, an AI tutor explains the concept and guides you to the correct solution without just handing it to you.
