1 files changed, 55 insertions, 0 deletions
diff --git a/spec/services/groups/update_statistics_service_spec.rb b/spec/services/groups/update_statistics_service_spec.rb
new file mode 100644
index 00000000000..5bef51c2727
--- /dev/null
+++ b/spec/services/groups/update_statistics_service_spec.rb
@@ -0,0 +1,55 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Groups::UpdateStatisticsService do
+  let_it_be(:group, reload: true) { create(:group) }
+
+  let(:statistics) { %w(wiki_size) }
+
+  subject(:service) { described_class.new(group, statistics: statistics)}
+
+  describe '#execute', :aggregate_failures do
+    context 'when group is nil' do
+      let(:group) { nil }
+
+      it 'does nothing' do
+        expect(NamespaceStatistics).not_to receive(:new)
+
+        result = service.execute
+
+        expect(result).to be_error
+      end
+    end
+
+    context 'with an existing group' do
+      context 'when namespace statistics exists for the group' do
+        it 'uses the existing statistics and refreshes them' do
+          namespace_statistics = create(:namespace_statistics, namespace: group)
+
+          expect(namespace_statistics).to receive(:refresh!).with(only: statistics.map(&:to_sym)).and_call_original
+
+          result = service.execute
+
+          expect(result).to be_success
+        end
+      end
+
+      context 'when namespace statistics does not exist for the group' do
+        it 'creates the statistics and refreshes them' do
+          expect_next_instance_of(NamespaceStatistics) do |instance|
+            expect(instance).to receive(:refresh!).with(only: statistics.map(&:to_sym)).and_call_original
+          end
+
+          result = nil
+
+          expect do
+            result = service.execute
+          end.to change { NamespaceStatistics.count }.by(1)
+
+          expect(result).to be_success
+        end
+      end
+    end
+  end
+end