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diff --git a/spec/lib/banzai/filter/mermaid_filter_spec.rb b/spec/lib/banzai/filter/mermaid_filter_spec.rb
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+++ b/spec/lib/banzai/filter/mermaid_filter_spec.rb
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+require 'spec_helper'
+
+describe Banzai::Filter::MermaidFilter do
+ include FilterSpecHelper
+
+ it 'adds `js-render-mermaid` class to the `pre` tag' do
+ doc = filter("<pre class='code highlight js-syntax-highlight mermaid' lang='mermaid' v-pre='true'><code>graph TD;\n A--&gt;B;\n</code></pre>")
+ result = doc.xpath('descendant-or-self::pre').first
+
+ expect(result[:class]).to include('js-render-mermaid')
+ end
+end