Add tests to assert sidebar behavior

ee/spec/features/epics/epic_labels_spec.rb

@@ -11,6 +11,8 @@ describe 'Assign labels to an epic', :js do
     stub_licensed_features(epics: true)
     sign_in(user)
 
+    set_cookie('collapsed_gutter', 'true')
+
     visit group_epic_path(group, epic)
   end
 
@@ -30,4 +32,33 @@ describe 'Assign labels to an epic', :js do
       end
     end
   end
+
+  context 'when labels icon is clicked on collapsed sidebar' do
+    before do
+      page.within('aside.right-sidebar') do
+        find('.fa-tags').click
+      end
+      wait_for_requests
+    end
+
+    it 'expands sidebar' do
+      page.within('.content-wrapper .content') do
+        expect(page).to have_css('.right-sidebar-expanded')
+      end
+    end
+
+    it 'opens labels dropdown' do
+      page.within('aside.right-sidebar') do
+        expect(page).to have_css('.js-selectbox .dropdown.open')
+      end
+    end
+
+    it 'collapses sidebar when clicked outside' do
+      page.within('.content-wrapper') do
+        find('.content').click
+
+        expect(page).to have_css('.right-sidebar-collapsed')
+      end
+    end
+  end
 end