421 Frameworks Quarkus Testing Unit Tests

---
name: 421-frameworks-quarkus-testing-unit-tests
description: Use when you need to write fast unit tests for Quarkus applications — including pure tests with @ExtendWith(MockitoExtension.class), @QuarkusTest with @InjectMock for full CDI mock replacement, @InjectSpy for partial CDI bean mocking, REST Assured for resource-focused tests, @ParameterizedTest with @CsvSource / @MethodSource, QuarkusTestProfile for test-specific configuration overrides, and naming conventions (*Test → Surefire, *IT → Failsafe). For framework-agnostic Java use @131-java-testing-unit-testing. This should trigger for requests such as Add or improve unit tests in a Quarkus project; Reduce slow @QuarkusTest usage with Mockito-first tests; Add @InjectSpy partial mocking or QuarkusTestProfile configuration in Quarkus tests; Convert repeated test methods to @ParameterizedTest with @CsvSource or @MethodSource; Write fast pure unit tests for Quarkus services. Part of Plinth Toolkit
license: Apache-2.0
metadata:
  author: Juan Antonio Breña Moral
  version: 0.18.0
---
# Quarkus Unit Testing

Apply fast testing strategies for Quarkus: Mockito-first, QuarkusTest when CDI wiring matters.

**What is covered in this Skill?**

- Pure JUnit 5 + Mockito without container boot (@ExtendWith(MockitoExtension.class))
- @QuarkusTest with @InjectMock for full CDI bean replacement
- @InjectSpy for partial mocking — real bean wrapped as spy, specific methods overridden
- REST Assured for HTTP-level @QuarkusTest resource tests
- @ParameterizedTest with @CsvSource (inline data) and @MethodSource (complex objects)
- QuarkusTestProfile and @TestProfile for test-specific configuration overrides
- Naming conventions: *Test → Surefire (fast phase), *IT → Failsafe (verify phase)
- When to escalate to integration tests (`@422`)

**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
- **PREREQUISITE**: Project must compile before applying test improvements
- **SAFETY**: If compilation fails, stop immediately
- **BLOCKING CONDITION**: Compilation errors must be resolved by the user before proceeding
- **VERIFY**: Run `./mvnw clean verify` or `mvn clean verify` after applying improvements
- **BEFORE APPLYING**: Read the reference for detailed rules and examples

## When to use this skill

- Add or improve unit tests in a Quarkus project
- Reduce slow @QuarkusTest usage with Mockito-first tests
- Add @InjectSpy partial mocking or QuarkusTestProfile configuration in Quarkus tests
- Convert repeated test methods to @ParameterizedTest with @CsvSource or @MethodSource
- Write fast pure unit tests for Quarkus services

## Workflow

1. **Read reference and assess project context**

Read `references/421-frameworks-quarkus-testing-unit-tests.md` and inspect the current project setup before proposing changes.

2. **Gather scope and decide target improvements**

Identify requested outcomes, constraints, and the minimum safe set of changes to apply.

3. **Apply framework-aligned changes**

Implement or refactor configuration/code following the reference patterns and project conventions.

4. **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/421-frameworks-quarkus-testing-unit-tests.md](references/421-frameworks-quarkus-testing-unit-tests.md).