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Playwright's page.route() intercepts network requests at the browser layer, letting you mock APIs without external dependencies. This post shows a concrete pattern for reliable UI tests, common pitfalls with pattern matching and content-type, and how to verify mocks actually fired using traces.
Decide when to stub API calls with cy.intercept() or hit the real endpoint with cy.request() in Cypress. A practical guide compares speed, reliability, maintenance, and contract validation, then shows concrete test snippets and how to measure trade‑offs.
Learn how to mock external API calls in Playwright using network request interception. This guide covers prerequisites, step‑by‑step procedure with code examples, expected checks, and recovery options to keep your E2E tests deterministic and fast.
Use Puppeteer’s request interception to replace real API calls with mock responses, making end‑to‑end tests stable and fast. The post walks through a concrete example, highlights trade‑offs, and offers best‑practice tips.
Learn how to replace real backend calls with controlled stubs in Cypress, ensuring fast, deterministic tests. Follow this step‑by‑step guide to set up cy.intercept, validate requests, and handle failures.
Move beyond arbitrary cy.wait() calls. Cypress cy.intercept() enables deterministic API mocking, latency simulation, and contract validation across e2e and component tests—with practical patterns for GraphQL, binary payloads, and early-request blind spots.
playwright
cypressio
puppeteer