Track Frontend JavaScript errors with Playwright fixtures
AI Summary
This video tutorial covers how to leverage Playwright fixtures to detect and fail tests when JavaScript errors occur on the front end during test execution. The presenter starts by demonstrating a basic Playwright test that loads a page and verifies lazy-loaded content but points out the limitation that JavaScript exceptions on the page can go unnoticed by the test.
To handle this, the video shows how to listen for page error events using the Playwright page object and collect any JavaScript errors into an array. The test then asserts that this error array remains empty to catch errors during test runs.
Further, the video explains how to make this error detection scalable across multiple tests by extending and overriding the Playwright page fixture using custom fixtures. This allows automatic JavaScript error monitoring to apply to all tests using the page fixture.
The presenter also demonstrates adding a fixture option to configure tests to optionally fail or ignore JavaScript errors as needed on a per-test basis, highlighting the flexibility of Playwright fixtures.
Overall, the video provides a practical guide to enhance the reliability of Playwright end-to-end tests by integrating JavaScript error monitoring and configurable test failure conditions using fixtures.