Explore a pragmatic yet robust approach to testing hexagonal or onion architectures in this 30-minute conference talk from Devoxx. Learn how to effectively balance unit tests and integration tests for optimal coverage and execution speed in Spring Boot applications. Discover tools for integration testing and examine the granularity of unit tests, questioning whether every class truly needs separate testing. Through live coding demonstrations, gain insights into separating domain logic from access mechanisms and resource management. By the end of this session, develop a better understanding of testing strategies for onion architectures, enabling you to implement more efficient and comprehensive testing practices in your own projects.