1 files changed, 54 insertions, 0 deletions
diff --git a/spec/services/groups/update_service_spec.rb b/spec/services/groups/update_service_spec.rb
index 78deb3cf254..f50163041f8 100644
--- a/spec/services/groups/update_service_spec.rb
+++ b/spec/services/groups/update_service_spec.rb
@@ -444,6 +444,60 @@ RSpec.describe Groups::UpdateService, feature_category: :groups_and_projects do
     end
   end
 
+  context 'when setting enable_namespace_descendants_cache' do
+    let(:params) { { enable_namespace_descendants_cache: true } }
+
+    subject(:result) { described_class.new(public_group, user, params).execute }
+
+    context 'when the group_hierarchy_optimization feature flag is enabled' do
+      before do
+        stub_feature_flags(group_hierarchy_optimization: true)
+      end
+
+      context 'when enabling the setting' do
+        it 'creates the initial Namespaces::Descendants record' do
+          expect { result }.to change { public_group.reload.namespace_descendants.present? }.from(false).to(true)
+        end
+      end
+
+      context 'when accidentally enabling the setting again' do
+        it 'does nothing' do
+          namespace_descendants = create(:namespace_descendants, namespace: public_group)
+
+          expect { result }.not_to change { namespace_descendants.reload }
+        end
+      end
+
+      context 'when disabling the setting' do
+        before do
+          params[:enable_namespace_descendants_cache] = false
+        end
+
+        it 'removes the Namespaces::Descendants record' do
+          create(:namespace_descendants, namespace: public_group)
+
+          expect { result }.to change { public_group.reload.namespace_descendants }.to(nil)
+        end
+
+        context 'when the Namespaces::Descendants record is missing' do
+          it 'does not raise error' do
+            expect { result }.not_to raise_error
+          end
+        end
+      end
+    end
+
+    context 'when the group_hierarchy_optimization feature flag is disabled' do
+      before do
+        stub_feature_flags(group_hierarchy_optimization: false)
+      end
+
+      it 'does nothing' do
+        expect { result }.not_to change { public_group.reload.namespace_descendants.present? }.from(false)
+      end
+    end
+  end
+
   context 'EventStore' do
     let(:service) { described_class.new(group, user, **params) }
     let(:root_group) { create(:group, path: 'root') }