snapshot-testing

Snapshot testing detects regressions by comparing current application outputs against human-reviewed baseline files. It uses diffing mechanisms to automatically fail tests when unexpected changes occur in API responses or rendered HTML, ensuring stability before production.

You can automate API surface verification by using the Verify library to capture serialized outputs and HTTP responses. The skill compares these current outputs against approved baselines to detect unintended changes during test runs.

Yes, snapshot testing can validate rendered emails and serialized outputs. The skill captures these outputs and compares them against human-approved baseline files to ensure no unintended alterations have occurred.

The best way to catch unintended visual changes is snapshot testing. It verifies rendered HTML output against a baseline file, automatically failing tests when unexpected visual regressions occur during UI updates.

Snapshot testing relies on human-reviewed baseline files. Once a baseline is approved, the skill automates subsequent test runs by diffing current outputs against these files, failing only when unexpected changes are detected.