Add helper to disable css animation in rspec

spec/disable_css_animation.js

+/* eslint-disable */
+// Disable eslint because capybara does not know es6
+
+var disableAnimationStyles = '-webkit-transition: none !important;' +
+                             '-moz-transition: none !important;' +
+                             '-ms-transition: none !important;' +
+                             '-o-transition: none !important;' +
+                             'transition: none !important;'
+
+window.onload = function() {
+  var animationStyles = document.createElement('style');
+  animationStyles.type = 'text/css';
+  animationStyles.innerHTML = '* {' + disableAnimationStyles + '}';
+  document.head.appendChild(animationStyles);
+};

spec/disable_css_animation_helper.rb

+Capybara.register_driver :poltergeist do |app|
+  opts = {
+    extensions: ["#{Rails.root}/spec/disable_css_animation.js"] # or wherever
+  }
+
+  Capybara::Poltergeist::Driver.new(app, opts)
+end
+
+Capybara.javascript_driver = :poltergeist

spec/features/issues/form_spec.rb

 require 'rails_helper'
+require 'disable_css_animation_helper'
 
 describe 'New/edit issue', feature: true, js: true do
   include GitlabRoutingHelper
@@ -33,48 +34,12 @@ describe 'New/edit issue', feature: true, js: true do
 
         # TODO: Figure out a better way to wait for dropdown CSS hide
         # animation to complete
-        sleep 0.3
+        # 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'
-      end
-
-      it 'unselects other assignees when unassigned is selected' do
-        page.within '.dropdown-menu-user' do
-          click_link user2.name
-        end
-
-        page.within '.dropdown-menu-user' do
-          click_link 'Unassigned'
-        end
-
-        page.within '.js-assignee-search' do
-          expect(page).to have_content 'Unassigned'
-        end
-
-        expect(find('input[name="issue[assignee_ids][]"]', visible: false).value).to match('0')
-      end
-
-      it 'toggles assign to me when current user is selected and unselected' do
-        page.within '.dropdown-menu-user' do
-          click_link user.name
-        end
-
-        expect(find('a', text: 'Assign to me', visible: false)).not_to be_visible
-
-        page.within '.dropdown-menu-user' do
-          click_link user.name
-        end
-
-        expect(find('a', text: 'Assign to me')).to be_visible
-      end
-    end
-
     it 'allows user to create new issue' do
       fill_in 'issue_title', with: 'title'
       fill_in 'issue_description', with: 'title'