Error Handling and Resilience Checks

Treat expected failures explicitly: intercept network errors and assert UI fallbacks (error-message visible, retries triggered).
In Cypress, use scoped Cypress.on('uncaught:exception') to ignore known errors; rethrow anything else so regressions fail.
In Playwright, hook page.on('pageerror') and only swallow the specific, documented error messages.
Test retry/backoff logic by forcing sequential failures (e.g., 500, timeout, success) and asserting telemetry gets recorded.
Log captured errors with context (request payload, user/session) but redact secrets to keep artifacts safe for sharing.

Source: Murat error-handling patterns, Pact resilience guidance.