| name | 521-frameworks-micronaut-testing-unit-tests |
| description | Use when you need to write unit tests for Micronaut applications — Mockito-first with @ExtendWith(MockitoExtension.class), @MicronautTest with @MockBean, HttpClient @Client(/) assertions, @Property overrides, @ParameterizedTest, and *Test vs *IT naming. For framework-agnostic Java use @131-java-testing-unit-testing. This should trigger for requests such as Add or improve unit tests in a Micronaut project; Reduce unnecessary @MicronautTest usage with Mockito-first tests; Write Mockito-first unit tests for Micronaut services; Mock Micronaut bean collaborators in unit tests; Review fast Micronaut tests without application context. Part of Plinth Toolkit |
| license | Apache-2.0 |
| metadata | {"author":"Juan Antonio Breña Moral","version":"0.18.0"} |
Micronaut Unit Testing
Apply fast testing strategies for Micronaut: Mockito-first, narrow @MicronautTest when HTTP or DI replacement is required.
What is covered in this Skill?
- Pure JUnit 5 + Mockito without container boot
- @MicronautTest with @MockBean factory methods for collaborators
- HttpClient blocking exchanges against the embedded server
- @Property for deterministic configuration in tests
- @ParameterizedTest with @CsvSource / @MethodSource
- Naming: *Test → Surefire; *IT → Failsafe when configured
- When to escalate to
@522
Scope: Apply recommendations based on the reference rules and good/bad code examples.
Constraints
Compile before test refactors; verify the full suite after.
- MANDATORY: Run
./mvnw compile or mvn compile before applying any change
- SAFETY: If compilation fails, stop immediately
- VERIFY: Run
./mvnw clean verify or mvn clean verify after applying improvements
- BEFORE APPLYING: Read the reference for detailed rules and examples
- EDGE CASE: If request scope is ambiguous, stop and ask a clarifying question before applying changes
- EDGE CASE: If required inputs, files, or tooling are missing, report what is missing and ask whether to proceed with setup guidance
When to use this skill
- Add or improve unit tests in a Micronaut project
- Reduce unnecessary @MicronautTest usage with Mockito-first tests
- Write Mockito-first unit tests for Micronaut services
- Mock Micronaut bean collaborators in unit tests
- Review fast Micronaut tests without application context
Workflow
- Read reference and assess project context
Read references/521-frameworks-micronaut-testing-unit-tests.md and inspect the current project setup before proposing changes.
- Gather scope and decide target improvements
Identify requested outcomes, constraints, and the minimum safe set of changes to apply.
- Apply framework-aligned changes
Implement or refactor configuration/code following the reference patterns and project conventions.
- Run verification and report results
Execute appropriate build/tests and summarize what changed, what was verified, and any follow-up actions.
Reference
For detailed guidance, examples, and constraints, see references/521-frameworks-micronaut-testing-unit-tests.md.
