Fix Hangouts Chat service spec shared example

spec/models/project_services/hangouts_chat_service_spec.rb

@@ -45,7 +45,10 @@ describe HangoutsChatService do
       it 'calls Hangouts Chat API' do
         subject.execute(sample_data)
 
-        expect(WebMock).to have_requested(:post, webhook_url).once
+        expect(WebMock)
+          .to have_requested(:post, webhook_url)
+          .with { |req| req.body =~ /\A{"text":.+}\Z/ }
+          .once
       end
     end
 
@@ -62,13 +65,6 @@ describe HangoutsChatService do
         subject.execute(sample_data)
       end
 
-      it 'sends the simple text message to the Hangouts Chat API' do
-        subject.execute(sample_data)
-
-        expect(WebMock).to have_requested(:post, webhook_url).once
-          .with { |req| req.body =~ /\A{"text":.+}\Z/ }
-      end
-
       context 'with not default branch' do
         let(:sample_data) do
           Gitlab::DataBuilder::Push.build(project, user, nil, nil, 'not-the-default-branch')