API Mocking | Bondar Academy

Lesson Summary

In this lesson, we learn how to intercept browser API calls and provide our own responses, a process known as mocking . This is particularly useful for testing applications without relying on live data. Overview of the Test Application The test application loads a list of articles and tags from an API. We can observe the API requests in the Networking tab of the browser's developer tools. Using cy.intercept in Cypress To intercept API calls in Cypress, we use the cy.intercept method. Here are the key steps: Identify the API endpoint you want to intercept. Use cy.intercept with the appropriate arguments: Method type (e.g., GET , POST ) Endpoint URL Custom response object or fixture file Creating Fixture Files For larger responses, it's recommended to save the response in a fixture file . This keeps the code clean and manageable. For example: cy.intercept('GET', '/api/tags', { fixture: 'tags.json' }) Debugging Intercepts In the Cypress runner, you can view the routes tab to see how many times the API was intercepted and whether the mock response was provided. This helps in debugging issues related to API calls. Best Practices Define all mocks before executing the test scenario. Use wildcards in URLs to simplify intercepts. Check the routes section for debugging information. By following these steps, you can effectively mock API responses in your tests, ensuring a more controlled testing environment.