Spring Boot Test Patterns

Gives you battle-tested patterns for Spring Boot testing across the full stack: unit tests with Mockito, slice tests with @DataJpaTest and @WebMvcTest, and integration tests with Testcontainers. The real value is in the performance targets (unit under 50ms, slice under 100ms) and the opinionated guidance on when to use each approach. Covers the newer @ServiceConnection pattern for Spring Boot 3.5+ which cleans up container wiring considerably. The best practice section is blunt about avoiding @DirtiesContext and being strategic with @SpringBootTest since full context loading kills test suite speed. If you're tired of slow tests or confused about which annotation to reach for, this gives you a clear decision tree.

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last updated: Aug 21, 2026

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Install

$ npx -y skills add giuseppe-trisciuoglio/developer-kit --skill spring-boot-test-patterns --agent claude-code

Installs into .claude/skills of the current project.

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Spring Boot Testing Patterns

Overview

Comprehensive guidance for writing robust test suites for Spring Boot applications using JUnit 5, Mockito, Testcontainers, and performance-optimized slice testing patterns.

When to Use

Writing unit tests for services or repositories with mocked dependencies
Implementing integration tests with real databases via Testcontainers
Testing REST APIs with @WebMvcTest or MockMvc
Configuring @ServiceConnection for container management in Spring Boot 3.5+

Quick Reference

Test Type	Annotation	Target Time	Use Case
Unit Tests	`@ExtendWith(MockitoExtension.class)`	< 50ms	Business logic without Spring context
Repository Tests	`@DataJpaTest`	< 100ms	Database operations with minimal context
Controller Tests	`@WebMvcTest` / `@WebFluxTest`	< 100ms	REST API layer testing
Integration Tests	`@SpringBootTest`	< 500ms	Full application context with containers
Testcontainers	`@ServiceConnection` / `@Testcontainers`	Varies	Real database/message broker containers