'Verifiy that push() calls transport.write(data).'

@patch('twisted.internet.reactor.connectTCP')
def test_push(self, mock_connectTCP):

    self.obj_ut.add_connection()
    self.obj_ut.push('123    pickup')
    self.mock_reactor_cft.assert_called_with(self.obj_ut.connector.transport.write, '123    pickup')
