Feature: Mermaid Scenario: Basic Rendering Given I have a file 'mermaid.md' with content: """ --- --- {% mermaid %} sequenceDiagram participant John participant Alice Alice->>John: Hello John, how are you? John-->>Alice: Great! {% endmermaid %} """ When I run jekyll build Then the file '_site/mermaid.html' should exist And I should see svg output in '_site/mermaid.html'