Blog App with Spring Boot (Backend)

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Junit testing in Spring Boot:

In this example we'll write test for the Users package

Package com.example.blog_app_springboot.users:

  package com.example.blog_app_springboot.users;


import org.junit.jupiter.api.Order;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.autoconfigure.orm.jpa.DataJpaTest;
import org.springframework.test.context.ActiveProfiles;

@DataJpaTest
@ActiveProfiles("test")
public class UsersRepoTests {
    @Autowired
    private UserRepository userRepository;
    @Test
    @Order(1)
    void can_create_user() {
        var user = UserEntity.builder()
                .username("adminoq")
                .password("adminoq")
                .email("admin@gmail.com").build();
        userRepository.save(user);
    }
}

Setting up the JpaTestConfig:

@Configuration
public class JpaTestConfig {
    @Bean
    @Profile("test")
    public DataSource dataSource() {
        var dataSource = new DriverManagerDataSource();
        dataSource.setDriverClassName("org.h2.Driver");
        dataSource.setUrl("jdbc:h2:mem:test;DB_CLOSE_DELAY=-1");
        return dataSource;
    }
}

Test Result:

UsersServiceTests.java:

  public class UsersServiceTests {
    @Autowired
    UserService userService;

    @Test
    void can_create_users() {
        var user = userService.createUser(new CreateUserRequest(
           "najat Oracle",
           "15062024",
           "najatOracle@gmail.com"
        ));

        Assertions.assertNotNull(user);
        Assertions.assertEquals("najat Oracle", user.getUsername());
    }
}

Test Result:

Setting up Error Exception Handler

Create an ErrorResponse class:

  package com.example.blog_app_springboot.common.dtos;

import lombok.Builder;
import lombok.Data;

@Builder
@Data
public class ErrorResponse {
    private String message;
    private String details;
}

Creating the Response entity

  @ExceptionHandler({
            UserService.UserNotFoundException.class
    })
    ResponseEntity<ErrorResponse> handleUSerNotFoundException(Exception ex){
        String message;
        HttpStatus status;
        if(ex instanceof UserService.UserNotFoundException){
           message = ex.getMessage();
           status = HttpStatus.NOT_FOUND;
        }else{
            message = "Something went wrong";
            status = HttpStatus.INTERNAL_SERVER_ERROR;
        }
        ErrorResponse response = ErrorResponse.builder()
                .message(message)
                .build();
        return ResponseEntity.status(status).body(response);
    }

Example of use:

{
    "message": "User with Username: saidox not found",
    "details": null
}