Postman Playwright Integration: Testing UI and API Together

Testing modern applications requires a comprehensive approach that encompasses both frontend UI interactions and backend API validations. The integration of Postman's Application Inventory feature with Playwright UI tests addresses a common issue where UI tests may pass despite API contract breaches, or API tests succeed while the frontend miscalls endpoints. This workflow is exemplified with a user permissions management app using a React/JavaScript frontend and REST APIs to handle CRUD operations for permissions. Postman's Agent Mode automatically generates Playwright tests from frontend code, ensuring alignment between UI tests and API contracts. The process involves initializing with Postman CLI, running tests that combine UI testing with API validation, and utilizing Application Inventory for a holistic view, capturing real-time API calls and validating them against documented specifications. This integrated method reveals discrepancies such as contract drift, silent backend errors, and missing API coverage, ultimately enhancing the reliability and realism of testing by validating the complete user journey from browser interactions to backend responses.

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