321-frameworks: Spring Boot Skill для unit-тестов

--- name: 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 @MockitoBean for controllers, @JsonTest for JSON serialization, parameterized tests with @CsvSource/@MethodSource, test profiles, and @TestConfiguration. For framework-agnostic Java use @131-java-testing-unit-testing. For integration tests use @322-frameworks-spring-boot-testing-integration-tests. Part of the skills-for-java project license: Apache-2.0 metadata: author: Juan Antonio Breña Moral version: 0.14.0-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, @MockitoBean for controllers (Spring Boot 4.0.x — @MockBean removed) - @JsonTest for JSON serialization with correct JSON value assertions (extractingJsonPathStringValue, etc.) - Parameterized tests: @ParameterizedTest with @CsvSource or @MethodSource over copy-pasted methods - Java records for domain objects in tests - @TestConfiguration, @ActiveProfiles, @Primary fixed-clock beans for deterministic test setup - Modern mocking API: @MockitoBean / @MockitoSpyBean; @MockBean/@SpyBean are deprecated/removed in Boot 4.0.x **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).