Add spec

spec/features/issues/form_spec.rb

@@ -23,6 +23,22 @@ describe 'New/edit issue', feature: true, js: true do
       visit new_namespace_project_issue_path(project.namespace, project)
     end
 
+    describe 'single assignee' do
+      it 'hides assignee after selection' do
+        click_button 'Unassigned'
+
+        page.within('.dropdown-menu-user') do
+          click_link user.name
+        end
+
+        # TODO: Figure out a better way to wait for dropdown CSS hide
+        # animation to complete
+        sleep 0.3
+
+        expect(page.find('.dropdown-menu-user', visible: false)).not_to be_visible
+      end
+    end
+
     describe 'multiple assignees' do
       before do
         click_button 'Unassigned'

spec/features/issues/issue_sidebar_spec.rb

@@ -57,6 +57,16 @@ feature 'Issue Sidebar', feature: true do
         expect(page.find('.dropdown-menu-user-link.is-active')).to have_content(user.name)
       end
     end
+
+    context 'single assignee' do
+      it 'hides assignee after selection' do
+        page.within('.dropdown-menu-user') do
+          click_link user.name
+        end
+
+        expect(page.find('.block.assignee .selectbox', visible: false)).not_to be_visible
+      end
+    end
   end
 
   context 'as a allowed user' do