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Testing Spring Data JPA Repositories

This repository contains all the code examples from the Testing Spring Data JPA Repositories tutorial.

Original Article

Read the complete tutorial with detailed explanations here:
https://www.javapro.academy/testing-spring-data-jpa-repositories/

What's Inside

This repository includes working Java examples demonstrating:

Setting up repository tests with @DataJpaTest
Using TestEntityManager to insert test data independently
Testing derived query methods (e.g., findByDepartment)
Testing comparison queries with boundary conditions
Testing custom @Query JPQL methods with ordering
Testing projection interfaces and DTO queries
Why TestEntityManager is preferred over the repository for test setup

Prerequisites

Java 17 or higher
Maven (for dependency management)
Spring Boot 3.x

Running the Tests

Clone the repository:

git clone <your-repo-url>
cd testing-spring-data-jpa-repositories

Install dependencies:

mvn clean install

Run the tests:

mvn test

Or run the test class directly from your IDE (IntelliJ IDEA, Eclipse, VS Code).

Dependencies

The project uses the following key dependencies:

Spring Boot Starter Data JPA – JPA and Hibernate support
Spring Boot Starter Test – JUnit 5, AssertJ, and test utilities
H2 Database – In-memory database for testing

Learn More

Visit JavaPro Academy for more Java tutorials and courses:
https://www.javapro.academy/

Last Updated: February 9, 2026