def METHOD_NAME(self, mocker):
    import servicex
    root_file_transform_request = self._generate_transform_request()
    root_file_transform_request.result_destination = 'root'
    mock_transform_request_read = mocker.patch.object(
        servicex.models.TransformRequest,
        'lookup',
        return_value=root_file_transform_request)
    mock_processor = mocker.MagicMock(LookupResultProcessor)
    client = self._test_client(lookup_result_processor=mock_processor)
    response = client.put('/servicex/internal/transformation/1234/files',
                          json={
                              'paths': ["/foo/bar1.root", "/foo/bar2.root"],
                              'adler32': '12345',
                              'file_size': 1024,
                              'file_events': 500
                          })
    assert response.status_code == 200
    mock_transform_request_read.assert_called_with('1234')
    mock_processor.add_file_to_dataset.assert_called()
    assert response.json == {
        "request-id": '1234'
    }