“The course structure saved me weeks. I recommend it to any dev who wants to level up.”
Sarah M.
Backend developer, Paris
Popular
Fundamentals
Java Testing Masterclass
4.8(142 reviews)
3-4 weeks
Beginner
79,00 €one-time payment
Tests are not optional in production. This masterclass covers it all: unit tests with JUnit 5, mocking with Mockito, integration tests with TestContainers, API contract tests, and test strategy (pyramid, slicing). You will learn to write tests that truly protect against regressions without slowing development.
Technologies
JUnit 5MockitoTestContainersJaCoCo
What you will learn
JUnit 5: parameterized, nested, extensions
Mocking with Mockito and BDDMockito
TestContainers for integration tests
Test slicing with Spring Boot Test
Code coverage and mutation testing
Test strategy: pyramid and trade-offs
Reviews
What learners say
“The labs are at the right level — no copy-paste, you actually think. Exactly what I was looking for.”
James K.
Fullstack dev, London
“I had a technical interview the week after. The concepts really stuck.”
Yuki T.
Tech lead, Lyon
“Pro-level training, no fluff. The checklists and project code are my go-to reference.”
Léo D.
Java developer, Brussels
