Enable UsersGroup observer, Add group_member methods to NotificationService

app/services/notification_service.rb

@@ -148,6 +148,14 @@ class NotificationService
     mailer.project_access_granted_email(users_project.id)
   end
+  def new_group_member(users_group)
+    mailer.group_access_granted_email(users_group.id)
+  end
+
+  def update_group_member(users_group)
+    mailer.group_access_granted_email(users_group.id)
+  end
+
   protected
   # Get project users with WATCH notification level

config/application.rb

@@ -32,6 +32,7 @@ module Gitlab
                                      :project_observer,
                                      :system_hook_observer,
                                      :user_observer,
+                                     :users_group_observer,
                                      :users_project_observer
     # Set Time.zone default to the specified zone and make Active Record auto-convert to this zone.

spec/mailers/notify_spec.rb

@@ -347,4 +347,24 @@ describe Notify do
       end
     end
   end
+
+  describe 'group access changed' do
+    let(:group) { create(:group) }
+    let(:user) { create(:user) }
+    let(:membership) { create(:users_group, group: group, user: user) }
+
+    subject { Notify.group_access_granted_email(membership.id) }
+
+    it 'has the correct subject' do
+      should have_subject /access to group was granted/
+    end
+
+    it 'contains name of project' do
+      should have_body_text /#{group.name}/
+    end
+
+    it 'contains new user role' do
+      should have_body_text /#{membership.human_access}/
+    end
+  end
 end