new_contents: from yunity.api import serializers
  from yunity.models import Conversation as ConversationModel
  from yunity.utils.tests.abc import BaseTestCase, AnyResult
  
  
  class TestSerializers(BaseTestCase):
      def test_chat_with_empty_messages_serializable(self):
         self.given_data(ConversationModel.objects.create())
         self.when_calling(serializers.conversation)
         self.then_invocation_passed_with(AnyResult())
  
  
subject: Test for ConversationMessage serializer