1 files changed, 14 insertions, 0 deletions
diff --git a/spec/lib/banzai/filter/external_link_filter_spec.rb b/spec/lib/banzai/filter/external_link_filter_spec.rb
index 167397c736b..d9e4525cb28 100644
--- a/spec/lib/banzai/filter/external_link_filter_spec.rb
+++ b/spec/lib/banzai/filter/external_link_filter_spec.rb
@@ -80,4 +80,18 @@ describe Banzai::Filter::ExternalLinkFilter, lib: true do
       expect(filter(act).to_html).to eq(exp)
     end
   end
+
+  context 'for protocol-relative links' do
+    let(:doc) { filter %q(<p><a href="//google.com/">Google</a></p>) }
+
+    it 'adds rel="nofollow" to external links' do
+      expect(doc.at_css('a')).to have_attribute('rel')
+      expect(doc.at_css('a')['rel']).to include 'nofollow'
+    end
+
+    it 'adds rel="noreferrer" to external links' do
+      expect(doc.at_css('a')).to have_attribute('rel')
+      expect(doc.at_css('a')['rel']).to include 'noreferrer'
+    end
+  end
 end