CodeSmart Hoops

May 18, 2026 · Backend Development

Unit Testing Spring Transaction Propagation: Practical Insights

This article provides a complete, runnable unit‑test suite for Spring Boot 3.x that demonstrates and verifies every transaction‑propagation behavior (REQUIRED, REQUIRES_NEW, NESTED, SUPPORTS, MANDATORY), highlights common pitfalls such as self‑calls and swallowed exceptions, and shows how to configure the environment, write the test code, and run the tests.