321-frameworks-spring-boot-testing-unit-tests
Use when you need to write unit tests for Spring Boot applications — including pure unit tests with @ExtendWith(MockitoExtension.class) for @Service/@Component, slice tests with @WebMvcTest and @MockBean for controllers, @JsonTest for JSON serialization. For framework-agnostic Java use @131-java-testing-unit-testing. Part of the skills-for-java project
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- Repository
- jabrena/cursor-rules-examples
- Last source activity
- March 19, 2026 at 20:26
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- English
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- 321-frameworks-spring-boot-testing-unit-tests
- description
- Use when you need to write unit tests for Spring Boot applications — including pure unit tests with @ExtendWith(MockitoExtension.class) for @Service/@Component, slice tests with @WebMvcTest and @MockBean for controllers, @JsonTest for JSON serialization. For framework-agnostic Java use @131-java-testing-unit-testing. Part of the skills-for-java project
- license
- Apache-2.0
- metadata
- {"author":"Juan Antonio Breña Moral","version":"0.13.0-SNAPSHOT"}
# Spring Boot Unit Testing with Mockito
Apply Spring Boot unit testing guidelines with Mockito.
**What is covered in this Skill?**
- Pure unit tests: @ExtendWith(MockitoExtension.class), @Mock, @InjectMocks for @Service/@Component (no Spring context)
- Slice tests: @WebMvcTest, @MockBean for controllers
- @JsonTest for JSON serialization
- @TestConfiguration, @ActiveProfiles for test setup
**Scope:** Apply recommendations based on the reference rules and good/bad code examples. For integration tests use @322-frameworks-spring-boot-testing-integration-tests.
## Constraints
Before applying any test changes, ensure the project compiles. If compilation fails, stop immediately. After applying improvements, run full verification.
- **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 good/bad patterns
## When to use this skill
- Review Java code for Spring Boot unit tests
- Apply best practices for Spring Boot unit tests in Java code
## Reference
For detailed guidance, examples, and constraints, see [references/321-frameworks-spring-boot-testing-unit-tests.md](references/321-frameworks-spring-boot-testing-unit-tests.md).
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