User can post a degradation event using REST API and get a Degradation Event response JSON

Oct 13, 2025 by wbrum.org 76 views

Overview

In this article, we will explore the implementation of a POST degradation event using mocked third-party dependencies. This approach allows us to isolate the dependencies and focus on the core functionality of the system. We will also discuss the importance of mocking dependencies and how it can be beneficial in software development.

Acceptance Criteria

Before we dive into the implementation, let's outline the acceptance criteria for this feature:

User can post a degradation event using REST API and get a Degradation Event response JSON: The user should be able to send a POST request to the REST API with the required data and receive a JSON response containing the degradation event details.
The response JSON can have mocked GitHub and OrgChart data: The response JSON should contain mocked data for GitHub and OrgChart, which can be easily switched to real implementation later.
The mocked data must come from internal interfaces that can be easily switched to real implementation later: The mocked data should be retrieved from internal interfaces that can be easily replaced with real implementation later.
The response JSON must return the Degradation Event Id, at least: The response JSON should contain the Degradation Event Id, which is the primary key of the degradation event.
The Degradation Event must be persisted at least in an in-memory database, ready to be switched to a "real" database later: The degradation event should be persisted in an in-memory database, which can be easily switched to a real database later.

Benefits of Mocking Dependencies

Mocking dependencies is an essential technique in software development that allows us to isolate the dependencies and focus on the core functionality of the system. By mocking dependencies, we can:

Reduce coupling: Mocking dependencies reduces coupling between the system and the dependencies, making it easier to change or replace the dependencies without affecting the system.
Improve testability: Mocking dependencies makes it easier to test the system, as we can control the behavior of the dependencies and test the system in isolation.
Increase flexibility: Mocking dependencies allows us to switch between different implementations of the dependencies, making it easier to test different scenarios and configurations.

Implementation

To implement the POST degradation event with mocked third-party dependencies, we will use the following approach:

Create a REST API endpoint: We will create a REST API endpoint that accepts a POST request with the required data and returns a JSON response containing the degradation event details.
Use a mocking library: We will use a mocking library to create mocked instances of the third-party dependencies, such as GitHub and OrgChart.
Use an in-memory database: We will use an in-memory database to persist the degradation event, which can be easily switched to a real database later.

Step 1: Create a REST API Endpoint

To create a REST API endpoint, we will use a framework such as Spring Boot or Express.js. We will define a POST endpoint that accepts a JSON request body with the required data and returns a JSON response containing the degradation event details.

@RestController
@RequestMapping("/api/degradation-events")
public class DegradationEventController {

    @PostMapping
    public ResponseEntity<DegradationEvent> createDegradationEvent(@RequestBody DegradationEventRequest request) {
        // Create a new degradation event
        DegradationEvent degradationEvent = new DegradationEvent(request);

        // Save the degradation event to the database
        degradationEventRepository.save(degradationEvent);

        // Return the degradation event details
        return ResponseEntity.ok(degradationEvent);
    }
}

Step 2: Use a Mocking Library

To create mocked instances of the third-party dependencies, we will use a mocking library such as Mockito or Moq. We will create mocked instances of the GitHub and OrgChart dependencies and use them in the REST API endpoint.

@Mock
private GitHub github;

@Mock
private OrgChart orgChart;

@BeforeEach
void setup() {
    // Create a new mocked instance of the GitHub dependency
    github = mock(GitHub.class);

    // Create a new mocked instance of the OrgChart dependency
    orgChart = mock(OrgChart.class);
}

Step 3: Use an In-Memory Database

To persist the degradation event, we will use an in-memory database such as H2 or HSQLDB. We will create a new instance of the in-memory database and use it to save the degradation event.

@Configuration
public class DatabaseConfig {

    @Bean
    public DataSource dataSource() {
        // Create a new instance of the in-memory database
        return DataSourceBuilder.create()
                .driverClassName("org.h2.Driver")
                .url("jdbc:h2:mem:test")
                .username("sa")
                .password("")
                .build();
    }
}

Step 4: Integrate the Mocked Dependencies

To integrate the mocked dependencies, we will use the mocking library to create instances of the dependencies and use them in the REST API endpoint.

@RestController
@RequestMapping("/api/degradation-events")
public class DegradationEventController {

    @Autowired
    private GitHub github;

    @Autowired
    private OrgChart orgChart;

    @PostMapping
    public ResponseEntity<DegradationEvent> createDegradationEvent(@RequestBody DegradationEventRequest request) {
        // Create a new degradation event
        DegradationEvent degradationEvent = new DegradationEvent(request);

        // Use the mocked dependencies to retrieve data
        String githubData = github.getData();
        String orgChartData = orgChart.getData();

        // Save the degradation event to the database
        degradationEventRepository.save(degradationEvent);

        // Return the degradation event details
        return ResponseEntity.ok(degradationEvent);
    }
}

Step 5: Test the REST API Endpoint

To test the REST API endpoint, we will use a testing framework such as JUnit or TestNG. We will create a new test class that tests the REST API endpoint and verifies that it returns the correct response.

@Test
public void testCreateDegradationEvent() {
    // Create a new degradation event request
    DegradationEventRequest request = new DegradationEventRequest();

    // Send a POST request to the REST API endpoint
    ResponseEntity<DegradationEvent> response = restTemplate.postForEntity("/api/degradation-events", request, DegradationEvent.class);

    // Verify that the response is correct
    assertEquals(HttpStatus.OK, response.getStatusCode());
    assertNotNull(response.getBody());
}

Conclusion

Overview

In our previous article, we explored the implementation of a POST degradation event using mocked third-party dependencies. We discussed the benefits of mocking dependencies and provided a step-by-step guide on how to implement the POST degradation event with mocked third-party dependencies using a REST API endpoint, a mocking library, an in-memory database, and a testing framework. In this article, we will answer some frequently asked questions (FAQs) related to implementing POST degradation event with mocked third-party dependencies.

Q&A

Q: What are the benefits of mocking dependencies?

A: Mocking dependencies is an essential technique in software development that allows us to isolate the dependencies and focus on the core functionality of the system. By mocking dependencies, we can reduce coupling, improve testability, and increase flexibility.

Q: How do I choose the right mocking library for my project?

A: There are several mocking libraries available, including Mockito, Moq, and EasyMock. The choice of mocking library depends on the programming language and the specific requirements of your project. You can choose a mocking library based on its popularity, ease of use, and features.

Q: How do I create a mocked instance of a dependency?

A: To create a mocked instance of a dependency, you can use a mocking library such as Mockito or Moq. You can create a new instance of the dependency and use the mocking library to control its behavior.

Q: How do I use an in-memory database to persist data?

A: To use an in-memory database to persist data, you can create a new instance of the in-memory database and use it to save data. You can use a database framework such as Spring Data JPA or Hibernate to interact with the in-memory database.

Q: How do I test a REST API endpoint with mocked dependencies?

A: To test a REST API endpoint with mocked dependencies, you can use a testing framework such as JUnit or TestNG. You can create a new test class that tests the REST API endpoint and verifies that it returns the correct response.

Q: What are some common pitfalls to avoid when implementing POST degradation event with mocked third-party dependencies?

A: Some common pitfalls to avoid when implementing POST degradation event with mocked third-party dependencies include:

Not isolating dependencies: Failing to isolate dependencies can lead to tight coupling and make it difficult to test and maintain the system.
Not using a mocking library: Failing to use a mocking library can make it difficult to control the behavior of dependencies and test the system.
Not using an in-memory database: Failing to use an in-memory database can make it difficult to persist data and test the system.
Not testing the system thoroughly: Failing to test the system thoroughly can lead to bugs and errors in the production environment.

Q: How do I troubleshoot issues with POST degradation event with mocked third-party dependencies?

A: To troubleshoot issues with POST degradation event with mocked third-party dependencies, you can use a combination of debugging tools and testing frameworks. You can use a debugger to step through the code and identify the source of the issue, and you can use a testing framework to test the system and verify that it returns the correct response.

Conclusion

In this article, we answered some frequently asked questions (FAQs) related to implementing POST degradation event with mocked third-party dependencies. We discussed the benefits of mocking dependencies, how to choose the right mocking library, how to create a mocked instance of a dependency, how to use an in-memory database, how to test a REST API endpoint with mocked dependencies, and some common pitfalls to avoid. We also provided some tips on how to troubleshoot issues with POST degradation event with mocked third-party dependencies.