The Browser Test Failed. Can You Actually Prove Why?

Short summary

Browser test failures in CI often create ambiguity across three systems: the application, the test, and the execution environment. Strong failure evidence—screenshots, DOM state, console logs, videos, and correlated application logs—determines whether teams can quickly resolve failures or waste time investigating. As AI-generated tests become common, teams must distinguish UI drift from agent drift, implement risk-proportional testing for generated code changes, and prioritize testing complex interactions to truly evaluate tool quality.

• •Test failures require diagnosing whether the app, test, or environment changed
• •Rich failure evidence (screenshots, logs, video, timing) cuts investigation time dramatically
• •AI-generated tests require tracking model decisions and distinguishing agent drift from UI changes

Generated with AI, which can make mistakes.