Remove Mattermost team with GitLab group

When destroying a group, now an API call is made to the Mattermost
server to request the deletion of the project. Actual team deletion on
the Mattermost side happens async, so the runtime shouldn't increase by
more than a second.

1 files changed, 10 insertions, 0 deletions

diff --git a/spec/services/groups/destroy_service_spec.rb b/spec/services/groups/destroy_service_spec.rb
index d59b37bee36..449fb33e0dc 100644
--- a/spec/services/groups/destroy_service_spec.rb
+++ b/spec/services/groups/destroy_service_spec.rb
@@ -35,6 +35,16 @@ describe Groups::DestroyService, services: true do
       it { expect(NotificationSetting.unscoped.all).not_to include(notification_setting) }
     end
 
+    context 'mattermost team' do
+      let!(:chat_team) { create(:chat_team, namespace: group) }
+
+      it 'destroys the team too' do
+        expect_any_instance_of(Mattermost::Team).to receive(:destroy)
+
+        destroy_group(group, user, async)
+      end
+    end
+
     context 'file system' do
       context 'Sidekiq inline' do
         before do