Track git blame clicks from code search results

Changelog: changed

app/views/search/results/_blob_highlight.html.haml

@@ -10,7 +10,13 @@
           .line-numbers
             .gl-display-flex
               %span.diff-line-num.gl-pl-3
-                %a.has-tooltip{ href: "#{blame_link}#L#{i}", id: "blame-L#{i}", 'data-line-number' => i, title: _('View blame') }
+                %a.has-tooltip{ href: "#{blame_link}#L#{i}",
+                                id: "blame-L#{i}",
+                                data: { "line_number" => i,
+                                        "track_action" => 'click_link',
+                                        "track_label" => 'git_blame',
+                                        "track_property" => 'search_result' },
+                                title: _('View blame') }
                   = sprite_icon('git')
               %span.diff-line-num.flex-grow-1.gl-pr-3
                 %a{ href: "#{blob_link}#L#{i}", id: "blob-L#{i}", 'data-line-number' => i, class: 'gl-display-flex! gl-align-items-center gl-justify-content-end' }

spec/views/search/_results.html.haml_spec.rb

@@ -96,6 +96,31 @@ RSpec.describe 'search/_results' do
       end
     end
 
+    describe 'git blame click tracking' do
+      let(:scope) { 'blobs' }
+      let(:search_objects) { Gitlab::ProjectSearchResults.new(user, 'testing', project: project).objects(scope) }
+
+      context 'when admin mode is enabled', :enable_admin_mode do
+        it 'renders the click link event tracking attributes' do
+          render
+
+          expect(rendered).to have_selector('[data-track-action=click_link]')
+          expect(rendered).to have_selector('[data-track-label=git_blame]')
+          expect(rendered).to have_selector('[data-track-property=search_result]')
+        end
+      end
+
+      context 'when admin mode is disabled' do
+        it 'does not render the click link event tracking attributes' do
+          render
+
+          expect(rendered).not_to have_selector('[data-track-action=click_link]')
+          expect(rendered).not_to have_selector('[data-track-label=git_blame]')
+          expect(rendered).not_to have_selector('[data-track-property=search_result]')
+        end
+      end
+    end
+
     %w[blobs notes wiki_blobs milestones].each do |search_scope|
       context "when scope is #{search_scope}" do
         let(:scope) { search_scope }