verify-email-snapshots

Snapshot testing detects email template regressions by comparing rendered HTML output against approved baselines using Verify, highlighting visual diffs for quick review. This ensures unintended changes are caught during code reviews.

Yes, Verify supports MJML-based templates by rendering them to ensure style fidelity. It works with any email renderer, allowing you to capture, review, and commit baseline verifications for your MJML emails.

You handle dynamic values in email snapshot tests by defining scrub rules within your test setup. These rules ensure deterministic tests by normalizing variable data before comparing rendered HTML against the approved baselines.

The workflow involves running snapshot tests to render templates, reviewing the visual diffs flagged by Verify, and committing the newly captured baseline verifications once the HTML changes are approved during code review.

Yes, email snapshot testing works with any email renderer, not just MJML. This allows you to verify HTML output across different rendering engines and flag visual changes across various clients consistently.