Posts tagged with testing

• Fast Mocked Responses in Playwright Getting You Down? Deferred Promises to the Rescue

  This post was published on January 30, 2026

  How to use deferred promises to control mock response timing in Playwright tests and avoid race conditions with instant responses.

• How Playwright Can Help You Write Better Tests by Separating Test and Production Data

  This post was published on July 1, 2022

  When running your Playwright tests, how do you load a different set of data based on the current execution environment?

• Mocking Browser Image Loading in Vitest: Property Descriptors, Prototypes, and WeakMap

  This post was published on February 20, 2026

  A deep dive into the JavaScript concepts behind mocking HTMLImageElement behaviour in Vitest, including Object.defineProperty, Object.getOwnPropertyDescriptor, prototype manipulation, and WeakMap for per-instance state tracking.

• Preventing Common Issues When Working with AI-Generated Code

  This post was published on January 28, 2026

  AI coding agents have made me significantly more productive as an engineer, but they have a systematic problem: as context fills, they drift from explicit guidance and violate documented patterns. This examines AI limitations and the workflow adaptations that help while labs address the underlying issues.

• What AI Agents Get Wrong About VRT, And How to Fix It

  This post was published on January 14, 2026

  Exploring common misconceptions AI agents have about Visual Regression Testing and practical solutions to address them.