def METHOD_NAME(self, client, mocker):
    import servicex
    from servicex.transformer_manager import TransformerManager
    mock_transformer_manager = mocker.MagicMock(TransformerManager)
    mock_transformer_manager.launch_transformer_jobs = mocker.Mock()
    mock_request = self._generate_transform_request()
    mock_request.save_to_db = mocker.Mock()
    mock_transform_request_read = mocker.patch.object(
        servicex.models.TransformRequest,
        'lookup',
        return_value=mock_request)
    mock_request.status = "Canceled"
    response = client.post('/servicex/internal/transformation/1234/start',
                           json={'max-event-size': 4567})
    assert response.status_code == 409
    mock_transform_request_read.assert_called_with('1234')