add feature spec

spec/features/groups/ldap_group_links_spec.rb

+require 'spec_helper'
+
+feature 'Edit group settings', :js do
+  given(:user) { create(:user) }
+  given(:group) { create(:group, path: 'foo') }
+
+  background do
+    group.add_owner(user)
+    sign_in(user)
+  end
+
+  context 'LDAP sync method' do
+    before do
+      allow(Gitlab.config.ldap).to receive(:enabled).and_return(true)
+
+      visit group_ldap_group_links_path(group)
+    end
+
+    scenario 'shows the LDAP filter section' do
+      choose('sync_method_filter')
+
+      expect(page).to have_content('This query must use valid LDAP Search Filter Syntax')
+      expect(page).not_to have_content("Synchronize #{group.name}'s members with this LDAP group")
+    end
+
+    scenario 'shows the LDAP group section' do
+      choose('sync_method_filter') # choose filter first, as group's the default
+      choose('sync_method_group')
+
+      expect(page).to have_content("Synchronize #{group.name}'s members with this LDAP group")
+      expect(page).not_to have_content('This query must use valid LDAP Search Filter Syntax')
+    end
+  end
+end