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Java Spring Boot Testing by wesleyegberto

Name: Java Spring Boot Testing
Author: wesleyegberto

Java Spring Boot Testing

Complete guide to testing in Spring Boot — unit tests with Mockito, controller tests (MockMVC standalone, @WebMvcTest, MockMvcTester, @SpringBootTest, WebTestClient), JPA repository tests, Testcontainers, Spring Cloud Contract, and stress testing. Use when writing or reviewing any Spring Boot test.

wesleyegberto a35d278 8 files · 29.1 KB Updated Sep 17, 2026

File contents

Spring Boot Testing

Guide to testing strategies and examples for Spring Boot applications.

When to Use This Skill

Write unit tests for services and components (JUnit 5 + Mockito)
Write controller tests: unit (standalone MockMVC) or integration (@WebMvcTest, @SpringBootTest)
Test JPA repositories with @DataJpaTest
Use Testcontainers for real database integration tests
Implement Consumer Driven Contracts with Spring Cloud Contract
Diagnose or simulate thread pool starvation
Benchmark performance with JMH

Reference Guide

Topic	Reference	Load When
Controller Tests	`references/controller-tests.md`	MockMVC standalone, @WebMvcTest, MockMvcTester, @SpringBootTest + MockMvc/TestRestTemplate, WebFluxTest + WebTestClient
Unit Testing	`references/unit-testing.md`	Service/component tests with Mockito, parameterized tests, test data builders
JPA Tests	`references/data-jpa-test.md`	@DataJpaTest, TestEntityManager, H2, real database, rollback, ordered tests
Testcontainers	`references/testcontainers.md`	PostgreSQL container, DynamicPropertySource, AbstractIntegrationTest
Test Configuration	`references/test-configuration.md`	application-test.yml, @TestConfiguration, TestDataFactory
Contract Testing	`references/contract-testing.md`	Spring Cloud Contract, Consumer Driven Contracts, WireMock stubs
Stress Testing	`references/stress-testing.md`	Thread pool starvation with JMeter, JMH micro-benchmarks

Testing Best Practices

Follow the AAA pattern (Arrange, Act, Assert)
Use @DisplayName for descriptive test names
Mock external dependencies in unit tests; use Testcontainers for real DB
Achieve 85%+ code coverage
Test both happy path and edge/error cases
Use @Transactional for automatic test data cleanup
Keep unit tests and integration tests in separate source sets or naming conventions
Use parameterized tests to cover multiple input scenarios
Test security rules (@WithMockUser) and input validation
Keep tests fast and independent — avoid shared mutable state

---name: java-spring-boot-testingdescription: Complete guide to testing in Spring Boot — unit tests with Mockito, controller tests (MockMVC standalone, @WebMvcTest, MockMvcTester, @SpringBootTest, WebTestClient), JPA repository tests, Testcontainers, Spring Cloud Contract, and stress testing. Use when writing or reviewing any Spring Boot test.---# Spring Boot TestingGuide to testing strategies and examples for Spring Boot applications.## When to Use This Skill- Write unit tests for services and components (JUnit 5 + Mockito)- Write controller tests: unit (standalone MockMVC) or integration (@WebMvcTest, @SpringBootTest)- Test JPA repositories with `@DataJpaTest`- Use Testcontainers for real database integration tests- Implement Consumer Driven Contracts with Spring Cloud Contract- Diagnose or simulate thread pool starvation- Benchmark performance with JMH## Reference Guide| Topic | Reference | Load When ||-------|-----------|-----------|| Controller Tests | `references/controller-tests.md` | MockMVC standalone, @WebMvcTest, MockMvcTester, @SpringBootTest + MockMvc/TestRestTemplate, WebFluxTest + WebTestClient || Unit Testing | `references/unit-testing.md` | Service/component tests with Mockito, parameterized tests, test data builders || JPA Tests | `references/data-jpa-test.md` | @DataJpaTest, TestEntityManager, H2, real database, rollback, ordered tests || Testcontainers | `references/testcontainers.md` | PostgreSQL container, DynamicPropertySource, AbstractIntegrationTest || Test Configuration | `references/test-configuration.md` | application-test.yml, @TestConfiguration, TestDataFactory || Contract Testing | `references/contract-testing.md` | Spring Cloud Contract, Consumer Driven Contracts, WireMock stubs || Stress Testing | `references/stress-testing.md` | Thread pool starvation with JMeter, JMH micro-benchmarks |## Testing Best Practices- Follow the **AAA pattern** (Arrange, Act, Assert)- Use `@DisplayName` for descriptive test names- Mock external dependencies in unit tests; use Testcontainers for real DB- Achieve **85%+ code coverage**- Test both happy path and edge/error cases- Use `@Transactional` for automatic test data cleanup- Keep unit tests and integration tests in separate source sets or naming conventions- Use parameterized tests to cover multiple input scenarios- Test security rules (`@WithMockUser`) and input validation- Keep tests fast and independent — avoid shared mutable state

Frequently asked questions