add-unit-test-layer

What problem does it solve?

This Skill eliminates the painful “first test layer” setup work by establishing reliable unit testing infrastructure for a Spring Boot 4 project, including strict compiler warnings and a JaCoCo coverage gate.

Core Features & Use Cases

• Compiler warnings as errors: Adds -Xlint:all and -Werror so new code compiles cleanly and surfaces issues early.
• JaCoCo coverage reporting and enforcement: Configures tasks.jacocoTestReport and tasks.jacocoTestCoverageVerification with a 95% minimum floor for instructions and branches.
• Baseline unit smoke test: Ensures the ApplicationTest with main_doesNotThrow() is present so the project has an initial, repeatable unit-test anchor.
• Scope: Intended for projects that are missing unit-test infrastructure beyond the default Initializr contextLoads, not for adding individual test classes or component-layer annotations like @WebMvcTest or @DataJpaTest.

Quick Start

Use add-unit-test-layer when your Spring Boot 4 project needs the initial unit-test infrastructure (JaCoCo, -Werror compiler flags, and the baseline ApplicationTest) and you want coverage enforcement before adding deeper component/e2e layers.