unit-test-service-layer

What problem does it solve?

This Skill enables developers to thoroughly test the business logic within their service layer classes in isolation, without relying on external dependencies like databases or other services.

Core Features & Use Cases

• Isolated Unit Testing: Write fast, reliable tests for @Service annotated classes.
• Dependency Mocking: Use Mockito to simulate the behavior of injected dependencies (repositories, other services).
• Business Logic Validation: Ensure core application logic functions correctly under various scenarios, including error conditions.
• Use Case: Test a UserService that depends on a UserRepository and an EmailService to ensure that when a user is created, the user data is saved correctly and a welcome email is sent, all without actually interacting with a database or sending an email.

Quick Start

Write a JUnit 5 test for the UserService class, mocking the UserRepository dependency to verify the getAllUsers method returns the expected list of users.