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spring-testing-fundamentals

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UpdatedApril 8, 2026 at 03:26

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.

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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`

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Spring Security 7 changed method security defaults and CSRF handling — tests using hasRole() or csrf() may need updates. Read before testing authentication, authorization, or secured endpoints. Triggers: @WithMockUser, csrf(), jwt(), oauth2Login(), SecurityFilterChain, @PreAuthorize, AccessDeniedException, @WithUserDetails, @WithSecurityContext, hasRole, hasAuthority, SCOPE_, JwtAuthenticationToken.

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WebFlux testing requires StepVerifier for reactive streams — standard assertions silently pass on empty Flux. WebTestClient API differs from MockMvc. Read before testing reactive endpoints. Triggers: @WebFluxTest, WebTestClient, StepVerifier, Mono, Flux, mockUser(), mockJwt(), mutateWith, verifyComplete, expectBody, expectStatus, @AutoConfigureWebTestClient.

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WebSocket tests require @SpringBootTest(RANDOM_PORT) and async message handling — @WebMvcTest won't work. Timeout and session leak traps are common. Read before testing STOMP or WebSocket. Triggers: WebSocketStompClient, StompSession, @MessageMapping, @SendToUser, BlockingQueue, /topic/, /queue/, CountDownLatch, session.subscribe, session.send.

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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`