Add test to access levels changes of users when LDAP group sync is true

spec/features/groups/members/override_ldap_memberships_spec.rb

+require 'spec_helper'
+
+feature 'Groups > Members > Master/Owner can override LDAP access levels', feature: true do
+  include WaitForAjax
+
+  let(:johndoe)  { create(:user, name: 'John Doe') }
+  let(:maryjane) { create(:user, name: 'Mary Jane') }
+  let(:owner)    { create(:user) }
+  let(:group)    { create(:group_with_ldap_group_link, :public) }
+
+  let!(:owner_member)   { create(:group_member, :owner, group: group, user: owner) }
+  let!(:ldap_member)    { create(:group_member, :guest, group: group, user: johndoe, ldap: true) }
+  let!(:regular_member) { create(:group_member, :guest, group: group, user: maryjane, ldap: false) }
+
+  background do
+    # We need to actually activate the LDAP config otherwise `Group#ldap_synced?` # will always be false!
+    allow(Gitlab.config.ldap).to receive_messages(enabled: true)
+
+    login_as(owner)
+  end
+
+  scenario 'owner can override LDAP access level', js: true do
+    ldap_override_message = 'John Doe is currently an LDAP user. Editing their permissions will override the settings from the LDAP group sync.'
+
+    visit group_group_members_path(group)
+
+    within "#group_member_#{ldap_member.id}" do
+      expect(page).to have_content 'LDAP'
+      expect(page).to have_button 'Guest', disabled: true
+      expect(page).to have_button 'Edit permissions'
+
+      click_button 'Edit permissions'
+    end
+
+    expect(page).to have_content ldap_override_message
+
+    click_button 'Change permissions'
+
+    expect(page).not_to have_content ldap_override_message
+    expect(page).not_to have_button 'Change permissions'
+
+    within "#group_member_#{ldap_member.id}" do
+      expect(page).not_to have_button 'Edit permissions'
+      expect(page).to have_button 'Guest', disabled: false
+
+      click_button 'Guest'
+
+      within '.dropdown-menu' do
+        click_link 'Revert to LDAP group sync settings'
+      end
+
+      wait_for_ajax
+
+      expect(page).to have_button 'Guest', disabled: true
+      expect(page).to have_button 'Edit permissions'
+    end
+
+    within "#group_member_#{regular_member.id}" do
+      expect(page).not_to have_content 'LDAP'
+      expect(page).not_to have_button 'Edit permissions'
+      expect(page).to have_button 'Guest', disabled: false
+
+      click_button 'Guest'
+
+      within '.dropdown-menu' do
+        expect(page).not_to have_content 'Revert to LDAP group sync settings'
+      end
+    end
+  end
+end