1 files changed, 58 insertions, 0 deletions
diff --git a/spec/lib/banzai/filter/ascii_doc_sanitization_filter_spec.rb b/spec/lib/banzai/filter/ascii_doc_sanitization_filter_spec.rb
new file mode 100644
index 00000000000..272b4386ec8
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+++ b/spec/lib/banzai/filter/ascii_doc_sanitization_filter_spec.rb
@@ -0,0 +1,58 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Banzai::Filter::AsciiDocSanitizationFilter do
+  include FilterSpecHelper
+
+  it 'preserves footnotes refs' do
+    result = filter('<p>This paragraph has a footnote.<sup>[<a id="_footnoteref_1" href="#_footnotedef_1" title="View footnote.">1</a>]</sup></p>').to_html
+    expect(result).to eq('<p>This paragraph has a footnote.<sup>[<a id="_footnoteref_1" href="#_footnotedef_1" title="View footnote.">1</a>]</sup></p>')
+  end
+
+  it 'preserves footnotes defs' do
+    result = filter('<div id="_footnotedef_1">
+<a href="#_footnoteref_1">1</a>. This is the text of the footnote.</div>').to_html
+    expect(result).to eq(%(<div id="_footnotedef_1">
+<a href="#_footnoteref_1">1</a>. This is the text of the footnote.</div>))
+  end
+
+  it 'preserves user-content- prefixed ids on anchors' do
+    result = filter('<p><a id="user-content-cross-references"></a>A link to another location within an AsciiDoc document.</p>').to_html
+    expect(result).to eq(%(<p><a id="user-content-cross-references"></a>A link to another location within an AsciiDoc document.</p>))
+  end
+
+  it 'preserves user-content- prefixed ids on div (blocks)' do
+    html_content = <<~HTML
+      <div id="user-content-open-block" class="openblock">
+        <div class="content">
+          <div class="paragraph">
+            <p>This is an open block</p>
+          </div>
+        </div>
+      </div>
+    HTML
+    output = <<~SANITIZED_HTML
+      <div id="user-content-open-block">
+        <div>
+          <div>
+            <p>This is an open block</p>
+          </div>
+        </div>
+      </div>
+    SANITIZED_HTML
+    expect(filter(html_content).to_html).to eq(output)
+  end
+
+  it 'preserves section anchor ids' do
+    result = filter(%(<h2 id="user-content-first-section">
+<a class="anchor" href="#user-content-first-section"></a>First section</h2>)).to_html
+    expect(result).to eq(%(<h2 id="user-content-first-section">
+<a class="anchor" href="#user-content-first-section"></a>First section</h2>))
+  end
+
+  it 'removes non prefixed ids' do
+    result = filter('<p><a id="cross-references"></a>A link to another location within an AsciiDoc document.</p>').to_html
+    expect(result).to eq(%(<p><a></a>A link to another location within an AsciiDoc document.</p>))
+  end
+end