Library › Book 13 › Network Interception, Mocking, and API Integration
Network Interception, Mocking, and API Integration
12.1🔒Learning ObjectivesBy the end of this chapter, you will be able to:
12.2🔒Why Mock the Network?Browser tests that hit real APIs have three problems:
12.3🔒Basic Route Handling
12.4🔒Testing Error StatesNetwork mocking shines when testing how the UI handles failures:
12.5🔒Modifying Requests and ResponsesSometimes you want to let the request go through but modify the response:
12.6🔒Blocking Third-Party ScriptsThird-party scripts (analytics, chat, ads) slow down tests, add visual noise, and can interfere with interactions (cookie consent banners…
12.7🔒Combining UI and API AssertionsThe most powerful tests verify both the UI and the API request:
12.8🔒Exercises1. Write a test that mocks an API response with specific data 2. Verify the UI displays the mocked data correctly 3. Change the mock data…
12.9🔒Q&AQuiz1. What is the primary benefit of network interception in browser tests? a) It makes tests faster b) It eliminates dependency on external…
12.10🔒Key Takeaways- page.route() intercepts requests and lets you mock responses, abort requests, or modify real responses. - Network mocking makes error…
12.11🔒Career Translation- "Designed network interception strategy that eliminated test dependency on 5 external APIs, reducing flake rate from 15% to 2%"…
12.12🔒Q&AInterview Depth CheckPrompt: "How would you design a mocking strategy for a test suite that tests an application with 10 external API integrations?"