Mocking API Response | Bondar Academy

Lesson Summary

In this lesson, we learn about mocking API calls , which involves replacing the actual API responses from a server with custom responses for testing purposes. This technique is particularly useful for: Testing edge case scenarios Simulating rare error messages Validating application behavior with large datasets, such as generating 100 users without affecting the database Mocking Tags in the Conduit Application We will create a mock for the popular tags section in the Conduit application. Here’s a step-by-step breakdown: Identify the Endpoint: Use the browser's developer tools to find the API endpoint responsible for fetching tags. Set Up the Mock: Before the application requests data, declare the mock using await page.route to intercept the API call. Create Mock Data: Construct a mock response object, modifying the original response to include only the desired tags. Fulfill the Mock: Use route.fulfill with the json property to return the mock data. Assertions: Validate that the application displays the mocked tags correctly using assertions. Best Practices To ensure robust tests: Use wildcards in URLs for flexibility across environments. Keep test data in separate JSON files for better organization and manageability. In summary, mocking API calls enhances testing efficiency and reliability by allowing developers to simulate various scenarios without altering the database or backend logic.