How to make a spring boot Application for testing

How to make a spring boot Application for testing

Here are the steps to create a Spring Boot application for testing purposes:

1. Install the Java Development Kit (JDK) and an IDE, such as IntelliJ IDEA, on your computer.
2. Launch the IDE and create a new project. Select “Spring Initializer” from the list of project templates.
3. Choose a project name and a location, then select the latest version of Spring Boot.
4. Select the desired dependencies for your project. For testing purposes, you may choose the “Spring Web” and “Spring Test” dependencies.
5. Click on “Generate” to create the project. The IDE will download the required dependencies and create the project structure.
6. Navigate to the “src/main/java” folder, and create a new class that represents the main component of the application.
7. Annotate the class with “@SpringBootApplication” and “@RestController”. The former enables Spring Boot’s auto-configuration and component scanning, while the latter allows you to define RESTful endpoints.
8. Implement a REST endpoint that returns a simple message, such as “Hello, World!”.
9. Navigate to the “src/test/java” folder, and create a new test class that tests the endpoint you just created.
10. Annotate the class with “@RunWith(SpringRunner.class)” and “@SpringBootTest”. The former sets the testing framework to use Spring’s testing support, while the latter enables testing of a Spring Boot application.
11. Use the “MockMvc” class from the “Spring Test” library to perform an HTTP GET request on the endpoint.
12. Assert that the response from the endpoint matches the expected message.
13. Run the test class to ensure that it passes.

 

• Here is a sample code for a REST endpoint in a Spring Boot application
• This code defines a simple REST endpoint that returns the message “Hello, World!” when a GET request is made to the /hello endpoint.
• The @RestController annotation indicates that this class is a controller and should handle HTTP requests.
• The @GetMapping annotation maps the /hello endpoint to the hello method, which returns a simple string message.

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class HelloController {
    
    @GetMapping("/hello")
    public String hello() {
        return "Hello, World!";
    }
}

 

 

 That’s it!

 You’ve now created a simple Spring Boot application and a test case to verify its functionality. You can expand on this example to add more endpoints, test cases, and functionalities as needed.