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REST APIs with Spring, JPA, and Springfox

Unit Testing with Mockito and JUnit5

Explore how to create effective unit tests for Spring REST API services using Mockito and JUnit5 frameworks. Learn to mock dependencies like repositories and validators, implement test cases with given-when-then structure, run tests with Gradle, and verify service methods to ensure correctness.

We'll cover the following...

TodoTypeServiceTest

Let’s start with unit testing TodoTypeService. We’ll create the TodoTypeServiceTest in the io.educative.unit package under the src/test/java directory.

Diff
package io.educative.unit;
import io.educative.repositories.TodoTypeRepository;
import io.educative.services.TodoTypeService;
import org.mockito.Mockito;
import javax.validation.Validator;
public class TodoTypeServiceTest {
    private TodoTypeRepository todoTypeRepository = Mockito.mock(TodoTypeRepository.class);
    private Validator validator = Mockito.mock(Validator.class);
    private TodoTypeService service = new TodoTypeService(todoTypeRepository, validator);
}

We’ve used the Mockito class from the Mockito framework to mock the TodoTypeRepository and Validator classes required to create the instance ...