Enable RSpec/NotToNot cop and auto-correct offenses

Also removes the note from the development/testing.md guide

1 files changed, 1 insertions, 1 deletions

diff --git a/spec/services/groups/create_service_spec.rb b/spec/services/groups/create_service_spec.rb
index 6aefb48a4e8..a97ac3ead45 100644
--- a/spec/services/groups/create_service_spec.rb
+++ b/spec/services/groups/create_service_spec.rb
@@ -14,7 +14,7 @@ describe Groups::CreateService, services: true do
 
     context "cannot create group with restricted visibility level" do
       before { allow(current_application_settings).to receive(:restricted_visibility_levels).and_return([Gitlab::VisibilityLevel::PUBLIC]) }
-      it { is_expected.to_not be_persisted }
+      it { is_expected.not_to be_persisted }
     end
   end
 end