Ensure JUnit test fails when Cypress tests fail

A practical guide showing how to make a JUnit test fail when Cypress end-to-end tests fail, using Testcontainers log output monitoring. The approach runs Cypress inside a Docker container via Testcontainers, parses the container's stdout with regex patterns to extract test counts (passing/failing), uses a CountDownLatch to wait for completion, and calls JUnit's fail() if any Cypress tests failed. Full working Java code is provided.