Add failing tests for #19028

spec/lib/banzai/filter/relative_link_filter_spec.rb

@@ -78,12 +78,24 @@ describe Banzai::Filter::RelativeLinkFilter, lib: true do
   end
 
   context 'with a valid repository' do
+    it 'rebuilds absolute URL for a file in the repo' do
+      doc = filter(link('/doc/api/README.md'))
+      expect(doc.at_css('a')['href']).
+        to eq "/#{project_path}/blob/#{ref}/doc/api/README.md"
+    end
+
     it 'rebuilds relative URL for a file in the repo' do
       doc = filter(link('doc/api/README.md'))
       expect(doc.at_css('a')['href']).
         to eq "/#{project_path}/blob/#{ref}/doc/api/README.md"
     end
 
+    it 'rebuilds relative URL for a file in the repo with leading ./' do
+      doc = filter(link('./doc/api/README.md'))
+      expect(doc.at_css('a')['href']).
+        to eq "/#{project_path}/blob/#{ref}/doc/api/README.md"
+    end
+
     it 'rebuilds relative URL for a file in the repo up one directory' do
       relative_link = link('../api/README.md')
       doc = filter(relative_link, requested_path: 'doc/update/7.14-to-8.0.md')