1 files changed, 80 insertions, 0 deletions
diff --git a/spec/features/groups/milestones/gfm_autocomplete_spec.rb b/spec/features/groups/milestones/gfm_autocomplete_spec.rb
new file mode 100644
index 00000000000..85a14123294
--- /dev/null
+++ b/spec/features/groups/milestones/gfm_autocomplete_spec.rb
@@ -0,0 +1,80 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe 'GFM autocomplete', :js do
+  let_it_be(:user) { create(:user, name: '💃speciąl someone💃', username: 'someone.special') }
+  let_it_be(:group) { create(:group, name: 'Ancestor') }
+  let_it_be(:project) { create(:project, :repository, group: group) }
+  let_it_be(:issue) { create(:issue, project: project, assignees: [user], title: 'My special issue') }
+  let_it_be(:label) { create(:group_label, group: group, title: 'special+') }
+  let_it_be(:milestone) { create(:milestone, resource_parent: group, title: "group milestone") }
+  let_it_be(:merge_request) { create(:merge_request, source_project: project) }
+
+  shared_examples 'displays autocomplete menu for all entities' do
+    it 'autocompletes all available entities' do
+      fill_in 'Description', with: User.reference_prefix
+      wait_for_requests
+      expect(find_autocomplete_menu).to be_visible
+      expect_autocomplete_entry(group.name)
+
+      fill_in 'Description', with: Label.reference_prefix
+      wait_for_requests
+      expect(find_autocomplete_menu).to be_visible
+      expect_autocomplete_entry(label.title)
+
+      fill_in 'Description', with: Milestone.reference_prefix
+      wait_for_requests
+      expect(find_autocomplete_menu).to be_visible
+      expect_autocomplete_entry(milestone.title)
+
+      fill_in 'Description', with: Issue.reference_prefix
+      wait_for_requests
+      expect(find_autocomplete_menu).to be_visible
+      expect_autocomplete_entry(issue.title)
+
+      fill_in 'Description', with: MergeRequest.reference_prefix
+      wait_for_requests
+      expect(find_autocomplete_menu).to be_visible
+      expect_autocomplete_entry(merge_request.title)
+    end
+  end
+
+  before_all do
+    group.add_maintainer(user)
+  end
+
+  describe 'new milestone page' do
+    before do
+      sign_in(user)
+      visit new_group_milestone_path(group)
+
+      wait_for_requests
+    end
+
+    it_behaves_like 'displays autocomplete menu for all entities'
+  end
+
+  describe 'update milestone page' do
+    before do
+      sign_in(user)
+      visit edit_group_milestone_path(group, milestone)
+
+      wait_for_requests
+    end
+
+    it_behaves_like 'displays autocomplete menu for all entities'
+  end
+
+  private
+
+  def find_autocomplete_menu
+    find('.atwho-view ul', visible: true)
+  end
+
+  def expect_autocomplete_entry(entry)
+    page.within('.atwho-container') do
+      expect(page).to have_content(entry)
+    end
+  end
+end