spring-testing-fundamentals

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Boot 4 renamed @MockBean to @MockitoBean, moved test slice annotations to new packages, and changed context caching behavior. Read for correct AssertJ/BDDMockito idioms and Boot 4 migration. Default fallback when no specific slice annotation is present. Triggers: assertThat, BDDMockito, ArgumentCaptor, @MockitoBean, @MockitoSpyBean, @DirtiesContext, UnnecessaryStubbingException, testing pyramid, context cache.

spring-ai-community By spring-ai-community schedule Updated 4/8/2026
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name: spring-testing-fundamentals description: "Boot 4 renamed @MockBean to @MockitoBean, moved test slice annotations to new packages, and changed context caching behavior. Read for correct AssertJ/BDDMockito idioms and Boot 4 migration. Default fallback when no specific slice annotation is present. Triggers: assertThat, BDDMockito, ArgumentCaptor, @MockitoBean, @MockitoSpyBean, @DirtiesContext, UnnecessaryStubbingException, testing pyramid, context cache." version: 0.1.0 license: Apache-2.0

Spring Testing Fundamentals

Signals: assertThat, assertThatThrownBy, given/willReturn, then(mock).should, ArgumentCaptor, @MockitoBean, @MockitoSpyBean, @DirtiesContext, context caching, testing pyramid

Tested With

  • Spring Boot 3.2+ / Spring Boot 4.x
  • Spring Framework 6.x / Spring Framework 7.x
  • AssertJ 3.24+
  • Mockito 5.x
  • JUnit 5

Do NOT Use This Skill When

You need domain-specific patterns:

  • Testing JPA repositories, Testcontainers, @DataJpaTest → use spring-jpa-testing
  • Testing REST controllers, MockMvc, @WebMvcTest → use spring-mvc-testing
  • Testing security, @WithMockUser, JWT, OAuth2 → use spring-security-testing
  • Testing reactive controllers, @WebFluxTest, StepVerifier → use spring-webflux-testing
  • Testing WebSocket/STOMP → use spring-websocket-testing

When to Read References

Situation Read
AssertJ scalars, optionals, BigDecimal, collections, exceptions references/assertj-mockito-idioms.md
BDDMockito given/willReturn, then(mock).should, argument matchers references/assertj-mockito-idioms.md
ArgumentCaptor usage and verification patterns references/assertj-mockito-idioms.md
UnnecessaryStubbingException and strict stubbing fixes references/assertj-mockito-idioms.md
@MockitoBean vs @MockitoSpyBean in Boot 4 references/assertj-mockito-idioms.md
Testing pyramid: when to use each slice annotation references/cross-cutting-testing-patterns.md
Context caching: why tests are slow, cache key, @DirtiesContext impact references/cross-cutting-testing-patterns.md
Universal anti-patterns across all Spring test types references/cross-cutting-testing-patterns.md
Boot 4 annotation migration checklist references/cross-cutting-testing-patterns.md
Install via CLI
npx skills add https://github.com/spring-ai-community/spring-testing-skills --skill spring-testing-fundamentals
Repository Details
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