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diff --git a/spec/frontend/static_site_editor/services/templater_spec.js b/spec/frontend/static_site_editor/services/templater_spec.js
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+++ b/spec/frontend/static_site_editor/services/templater_spec.js
@@ -0,0 +1,104 @@
+/* eslint-disable no-useless-escape */
+import templater from '~/static_site_editor/services/templater';
+
+describe('templater', () => {
+  const source = `Below this line is a simple ERB (single-line erb block) example.
+
+<% some erb code %>
+
+Below this line is a complex ERB (multi-line erb block) example.
+
+<% if apptype.maturity && (apptype.maturity != "planned") %>
+  <% maturity = "This application type is at the \"#{apptype.maturity}\" level of maturity." %>
+<% end %>
+
+Below this line is a non-erb (single-line HTML) markup example that also has erb.
+
+<a href="<%= compensation_roadmap.role_path %>"><%= compensation_roadmap.role_path %></a>
+
+Below this line is a non-erb (multi-line HTML block) markup example that also has erb.
+
+<ul>
+<% compensation_roadmap.recommendation.recommendations.each do |recommendation| %>
+  <li><%= recommendation %></li>
+<% end %>
+</ul>
+
+Below this line is a block of HTML.
+
+<div>
+  <h1>Heading</h1>
+  <p>Some paragraph...</p>
+</div>
+
+Below this line is a codeblock of the same HTML that should be ignored and preserved.
+
+\`\`\` html
+<div>
+  <h1>Heading</h1>
+  <p>Some paragraph...</p>
+</div>
+\`\`\`
+`;
+  const sourceTemplated = `Below this line is a simple ERB (single-line erb block) example.
+
+\`\`\` sse
+<% some erb code %>
+\`\`\`
+
+Below this line is a complex ERB (multi-line erb block) example.
+
+\`\`\` sse
+<% if apptype.maturity && (apptype.maturity != "planned") %>
+  <% maturity = "This application type is at the \"#{apptype.maturity}\" level of maturity." %>
+<% end %>
+\`\`\`
+
+Below this line is a non-erb (single-line HTML) markup example that also has erb.
+
+\`\`\` sse
+<a href="<%= compensation_roadmap.role_path %>"><%= compensation_roadmap.role_path %></a>
+\`\`\`
+
+Below this line is a non-erb (multi-line HTML block) markup example that also has erb.
+
+\`\`\` sse
+<ul>
+<% compensation_roadmap.recommendation.recommendations.each do |recommendation| %>
+  <li><%= recommendation %></li>
+<% end %>
+</ul>
+\`\`\`
+
+Below this line is a block of HTML.
+
+\`\`\` sse
+<div>
+  <h1>Heading</h1>
+  <p>Some paragraph...</p>
+</div>
+\`\`\`
+
+Below this line is a codeblock of the same HTML that should be ignored and preserved.
+
+\`\`\` html
+<div>
+  <h1>Heading</h1>
+  <p>Some paragraph...</p>
+</div>
+\`\`\`
+`;
+
+  it.each`
+    fn          | initial            | target
+    ${'wrap'}   | ${source}          | ${sourceTemplated}
+    ${'wrap'}   | ${sourceTemplated} | ${sourceTemplated}
+    ${'unwrap'} | ${sourceTemplated} | ${source}
+    ${'unwrap'} | ${source}          | ${source}
+  `(
+    'wraps $initial in a templated sse codeblocks if $fn is wrap, unwraps otherwise',
+    ({ fn, initial, target }) => {
+      expect(templater[fn](initial)).toMatch(target);
+    },
+  );
+});