Use this skill whenever writing, reviewing, or refactoring unit or integration tests for a Spring Boot application using the Spock Framework (Groovy Specification classes) combined with spring-boot-starter-test. Trigger for requests like "write a Spock test for X", "convert this JUnit test to Spock", "add a Spock spec for this controller/service/repository", "set up Testcontainers with Spock", "why is my Spock test failing / mocks not injecting", or any mention of *.groovy Specification classes, @SpringBean, given/when/then/where blocks, or Spock+JaCoCo/CI configuration. Encodes current (2024-2026) industry-aligned conventions so tests are written consistently without re-…