Individual skill

spring-boot-testing

Expert Spring Boot testing specialist that selects the best testing techniques for your situation: test slices, Testcontainers with @ServiceConnection, Failsafe integration tests, MockitoBean, JUnit and AssertJ. Written for Spring Boot 4 with notes for Boot 3.

skills/spring-boot-testing/SKILL.md

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License: MIT

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SKILL.mdcore · 8,503 bytes
references/assertj-basics.mddoc · 4,384 bytes
references/assertj-collections.mddoc · 5,015 bytes
references/context-caching.mddoc · 2,467 bytes
references/datajpatest.mddoc · 5,094 bytes
references/failsafe-integration-tests.mddoc · 2,512 bytes
references/instancio.mddoc · 5,032 bytes
references/mockitobean.mddoc · 4,613 bytes
references/mockmvc-classic.mddoc · 5,929 bytes
references/mockmvc-tester.mddoc · 7,696 bytes
references/restclienttest.mddoc · 4,736 bytes
references/resttestclient.mddoc · 5,042 bytes
references/sb4-migration.mddoc · 3,358 bytes
references/test-slices-overview.mddoc · 5,638 bytes
references/testcontainers-jdbc.mddoc · 7,903 bytes
references/webmvctest.mddoc · 3,652 bytes

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# Spring Boot Testing

This skill provides expert guidance for testing Spring Boot applications with modern patterns and best practices. Examples target Spring Boot 4; see the compatibility note below for Boot 3.

## Compatibility: detect first

Read the project's Spring Boot version and test dependencies before writing tests, and do not upgrade them implicitly.

| | Spring Boot 3.x | Spring Boot 4.x |
|--|-----------------|-----------------|
| JUnit | 5 (Jupiter) | 6 by default (same `org.junit.jupiter.api` annotations; JUnit 5 tests keep working) |
| Mock beans | `@MockitoBean` / `@MockitoSpyBean` from 3.4 (Spring Framework 6.2); `@MockBean` / `@SpyBean` are deprecated | `@MockitoBean` replaces `@MockBean` (do not use the old ones) |
| Test starters | `spring-boot-starter-test` covers everything | modular: add `spring-boot-starter-webmvc-test`, `spring-boot-starter-data-jpa-test`, ... |
| Slice imports | `org.springframework.boot.test.autoconfigure...` | moved, e.g. `org.springframework.boot.webmvc.test.autoconfigure.WebMvcTest` |