verify-email-snapshots

Automate snapshot testing for MJML email templates with the Verify framework.

57|7|Updated Aug 6, 2025

Search Tags:#testing #verification #email #regression #snapshot #mjml

Ready to run

npx skills add https://github.com/seiggy/lucia-dotnet --skill verify-email-snapshots-seiggy

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: verify-email-snapshots
Source: https://github.com/seiggy/lucia-dotnet/tree/main/.github/skills/verify-email-snapshots
Command: npx skills add https://github.com/seiggy/lucia-dotnet --skill verify-email-snapshots-seiggy

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill requires Verify.Xunit, and includes scripts (resource) and references (resource) components.

What problem does it solve?

This Skill prevents unintended visual changes in email templates by automatically comparing rendered output against approved baselines, ensuring consistency and catching regressions before they reach users.

Core Features & Use Cases

Snapshot Testing: Captures rendered HTML of email templates and fails tests if changes occur.
Regression Prevention: Ideal for CI/CD pipelines to catch visual bugs in email designs.
Code Review Aid: Provides clear visual diffs for reviewing template modifications.
Use Case: After updating an MJML email template for a password reset, this Skill will automatically verify that the generated HTML still renders correctly across different email clients, preventing broken layouts or missing information.

Quick Start

Run the snapshot tests for email templates to verify their rendering.

Frequently Asked Questions about verify-email-snapshots

High-intent search queries and answers about installing and using this skill.

FAQPage Schema

How do I catch email rendering regressions in automated tests?▼

Snapshot testing catches email rendering regressions by comparing rendered HTML output against approved baselines and failing tests if visual changes occur. This ensures consistency and prevents broken layouts from reaching users.

How does snapshot testing work with MJML templates?▼

Snapshot testing with MJML templates captures the rendered HTML output and validates variable substitution. It automatically verifies that generated HTML renders correctly across different email clients by comparing against an approved baseline.

Can I use Verify.Xunit to prevent unintended visual changes in email templates?▼

Yes, Verify.Xunit automates snapshot testing for email templates to detect regressions in rendered HTML output. It provides clear visual diffs for reviewing template modifications and preventing unintended visual changes.

What is the best way to test email templates in a CI/CD pipeline?▼

Snapshot testing is ideal for CI/CD pipelines to catch visual bugs in email designs. It automatically compares rendered email template output against approved baselines, preventing broken layouts or missing information before deployment.

Does snapshot testing validate dynamic variable substitution in HTML emails?▼

Yes, snapshot testing validates variable substitution within MJML templates. It captures the rendered HTML after variables are replaced, ensuring that dynamic content renders correctly and maintaining visual consistency across template variants.