How do you architect a Playwright test to verify atomic transaction rollback across UI and API state?
🚨 Playwright E2E Architect Challenge: How do you verify atomic transaction rollback across UI and API states, ensuring your tests don't fall for transient UIs? 📌 Problem Statement Verifying atomic transaction rollback (e.g., order placement, payment, inventory) in E2E tests is complex. If any part fails, the entire transaction must revert, and all states (UI & backend) must reflect this…
Verifying atomic transaction rollback across UI and API states in Playwright E2E tests requires a multi-step approach. First, force a failure in an intermediate API call, such as inventory update, using page.route to intercept the request and simulate an error. Next, proceed with the checkout process, which should trigger the payment and then the inventory call.
After the failure is injected, verify the UI's final error state by asserting the presence of a rollback or failure message, and then confirm the backend state has been restored by making direct API calls via request.newContext(). This dual verification ensures both UI and API states reflect the rollback consistently. Finally, use expect.poll to build resilient tests that wait for asynchronous operations, like backend rollbacks, to complete before considering the test successful.
This approach prevents flaky tests caused by transient UI states and ensures comprehensive transaction verification.
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