Fix broken spec

spec/lib/gitlab/metrics_dashboard/service_spec.rb

@@ -26,10 +26,8 @@ describe Gitlab::MetricsDashboard::Service, :use_clean_rails_memory_store_cachin
     end
 
     context 'when the dashboard is configured incorrectly' do
-      let(:bad_dashboard) { {} }
-
       before do
-        allow(described_class).to receive(:system_dashboard).and_return(bad_dashboard)
+        allow(YAML).to receive(:load_file).and_return({})
       end
 
       it 'returns an appropriate message and status code' do
@@ -37,7 +35,7 @@ describe Gitlab::MetricsDashboard::Service, :use_clean_rails_memory_store_cachin
 
         expect(result.keys).to contain_exactly(:message, :http_status, :status)
         expect(result[:status]).to eq(:error)
-        expect(result[:status]).to eq(:unprocessable_entity)
+        expect(result[:http_status]).to eq(:unprocessable_entity)
       end
     end
   end