Add epic quick actions feature specs

ee/spec/features/epics/user_uses_quick_actions_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+# Epics quick actions functionality are covered on unit test specs. These
+# are added just to test frontend features at least once, before adding more
+# specs to this file please take into account if there is any behaviour
+# different from the current ones that needs to be tested.
+RSpec.describe 'Epics > User uses quick actions', :js do
+  include Spec::Support::Helpers::Features::NotesHelpers
+
+  let_it_be(:user) { create(:user) }
+  let_it_be(:group) { create(:group) }
+  let_it_be(:epic_1) { create(:epic, group: group) }
+
+  before do
+    stub_licensed_features(epics: true, subepics: true)
+    group.add_reporter(user)
+    sign_in(user)
+  end
+
+  context 'on epic note' do
+    it 'applies quick action' do
+      epic_2 = create(:epic, group: group)
+      visit group_epic_path(group, epic_2)
+      wait_for_requests
+
+      add_note("new note \n\n/parent_epic #{epic_1.to_reference}")
+
+      wait_for_requests
+      expect(epic_2.reload.parent).to eq(epic_1)
+      expect(page).to have_content("added epic #{epic_1.to_reference} as parent epic")
+    end
+  end
+
+  context 'on epic form' do
+    it 'applies quick action' do
+      epic_title = 'New epic with parent'
+      visit new_group_epic_path(group)
+
+      find('#epic-title').native.send_keys(epic_title)
+      find('#epic-description').native.send_keys("With parent \n\n/parent_epic #{epic_1.to_reference}")
+      click_button 'Create epic'
+      wait_for_requests
+
+      expect(group.epics.find_by_title(epic_title).parent).to eq(epic_1)
+      expect(page).to have_content("added epic #{epic_1.to_reference} as parent epic")
+    end
+  end
+end