Spring Boot - HelpMeTest

Spring Boot

Spring Security Testing: @WithMockUser, JWT, and Method Security

Spring Security is the most undertested layer in most Spring Boot apps. This post shows how to use @WithMockUser, @WithSecurityContext, mockJwt(), and method security tests to actually verify your authorization rules. Security is the layer where bugs have the worst consequences — an unprotected endpoint or a misconfigured role check is

Spring Boot

Spring Data JPA Testing: @DataJpaTest, Custom Queries, and TestEntityManager

@DataJpaTest loads only the JPA layer — no controllers, no services, no security. Pair it with TestEntityManager for precise fixture control, and Testcontainers PostgreSQL when H2 is not enough. This post covers all the patterns you need for a solid repository test suite. The repository layer is where your application talks

Spring Boot

Spring WebFlux Testing: WebTestClient, StepVerifier, and Reactive Repositories

Reactive programming introduces a fundamentally different execution model — asynchronous, non-blocking, event-driven — and testing it requires a different mindset. You can't just call a method and check the return value; you need to subscribe to a stream, assert on emitted items, verify completion signals, and handle errors

Spring Boot

Spring Cloud Gateway Testing: Route Validation, Filter Testing, and WireMock Contracts

An API gateway is the front door to your microservices architecture. Every request passes through it — authentication checks, rate limiting, request transformation, circuit breaking, routing. If the gateway misbehaves, every service behind it is affected. Yet gateways are frequently undertested because developers assume the framework handles everything correctly, and testing

Spring Boot

Spring Batch Testing: JobLauncherTestUtils, Step-Scoped Beans, and Chunk Processing

Batch jobs process the most sensitive and voluminous data in many enterprise applications — billing runs, ETL pipelines, report generation, data migrations. A bug that skips a record or miscalculates a value can affect thousands of rows before anyone notices. Yet batch jobs are among the least-tested parts of most

Testing

REST Assured with Spring Boot: Testing REST Endpoints

Spring Boot and REST Assured are a natural combination. Spring Boot makes building REST APIs fast; REST Assured makes testing them readable. The combination gives you a complete Java API testing stack that covers everything from controller unit tests to full integration tests against a running server. This guide covers