Fix specs for renderer_spec.rb

spec/lib/banzai/renderer_spec.rb

@@ -16,6 +16,7 @@ describe Banzai::Renderer do
 
     context 'without cache' do
       let(:commit) { create(:project, :repository).commit }
+      let(:object) { fake_object(fresh: false) }
 
       it 'returns cacheless render field' do
         expect(renderer).to receive(:cacheless_render_field).with(commit, :title)
@@ -27,7 +28,7 @@ describe Banzai::Renderer do
         allow(Gitlab::Geo).to receive(:secondary?).and_return(true)
         expect(object).to receive(:refresh_markdown_cache!).with(do_update: false)
 
-        is_expected.to eq('field_html')
+        expect(renderer.render_field(object, :field)).to eq('field_html')
       end
     end