Add feature spec

spec/ee/spec/features/epics/epic_issues_spec.rb

 require 'spec_helper'
 
 describe 'Epic Issues', :js do
+  include DragTo
+
   let(:user) { create(:user) }
   let(:group) { create(:group, :public) }
   let(:epic) { create(:epic, group: group) }
@@ -40,6 +42,10 @@ describe 'Epic Issues', :js do
     it 'user cannot add new issues to the epic' do
       expect(page).not_to have_selector('.related-issues-block h3.panel-title button')
     end
+
+    it 'user cannot reorder issues in epic' do
+      expect(page).not_to have_selector('.js-related-issues-token-list-item.user-can-drag')
+    end
   end
 
   context 'when user is a group member' do
@@ -95,5 +101,15 @@ describe 'Epic Issues', :js do
         expect(page).to have_content(issue_to_add.title)
       end
     end
+
+    it 'user can reorder issues in epic' do
+      expect(first('.js-related-issues-token-list-item')).to have_content(public_issue.title)
+      expect(page.all('.js-related-issues-token-list-item').last).to have_content(private_issue.title)
+
+      drag_to(selector: '.issuable-list', to_index: 1)
+
+      expect(first('.js-related-issues-token-list-item')).to have_content(private_issue.title)
+      expect(page.all('.js-related-issues-token-list-item').last).to have_content(public_issue.title)
+    end
   end
 end