Setting Up JUnit Tests for Spotify API in Spring Boot

Working with APIs like Spotify in a Spring Boot application can be an exciting challenge. However, testing those integrations, especially with JUnit, can sometimes feel like navigating uncharted territory.

Github repository here https://github.com/Kvnbbg/spotify-web-api-java

If you’ve been feeling stuck or frustrated, don’t worry—you’re not alone!

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Here’s a simple guide to help you organize your JUnit tests and set up mocks for external API calls effectively.

Step-by-Step Guide

1. Set Up Mocks for API Calls

Use Mockito to mock external calls to the Spotify API. This ensures your tests run in isolation without actual API calls:

@Mock
private RestTemplate restTemplate;

@InjectMocks
private SpotifyService spotifyService;

@BeforeEach
void setUp() {
    MockitoAnnotations.openMocks(this);
}

2. Use MockRestServiceServer for RestTemplate

For more realistic mocking of HTTP calls:

MockRestServiceServer server = MockRestServiceServer.createServer(restTemplate);

server.expect(requestTo("https://api.spotify.com/v1/some-endpoint"))
      .andRespond(withSuccess("{\"key\":\"value\"}", MediaType.APPLICATION_JSON));

3. Organize Tests by Features

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Split your test files based on the functionality being tested—authentication, track search, etc. This makes them easier to maintain and debug.

4. Keep Unit and Integration Tests Separate

• Unit Tests: Test individual components in isolation.
• Integration Tests: Test how components interact, possibly with a mock Spotify API using WireMock.

5. Bonus: Automate Your Test Setup

Use a pre-configured test configuration for common mock setups to reduce boilerplate code!