new_contents: from raiden.tests.utils.factories import make_address, make_channel_identifier, make_transfer
  from raiden.transfer.mediated_transfer.events import SendRefundTransfer
  
  
  def test_send_refund_transfer_contains_balance_proof():
      recipient = make_address()
      transfer = make_transfer()
      message_identifier = 1
      channel_identifier = make_channel_identifier()
      event = SendRefundTransfer(
          recipient=recipient,
          channel_identifier=channel_identifier,
          message_identifier=message_identifier,
          transfer=transfer,
      )
  
      assert hasattr(event, 'balance_proof')
      assert SendRefundTransfer.from_dict(event.to_dict()) == event
  
subject: Add test that SendRefundTransfer contains a balance proof