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