Test generation failure when dataset contains non-ascii chars

[alanfranz]

Consider

https://github.com/alanfranz/pyjomap/tree/ecb4572851b0b1939eab747ac37edebd26c49524

and precisely the test case:

https://github.com/alanfranz/pyjomap/blob/ecb4572851b0b1939eab747ac37edebd26c49524/pyjomap/test/test_mapping.py#L45

I just refactored the tests to use genty_dataset. When running the tests (just run make test in project directory. Using python 2.7 and genty 1.3.2. ) I get the following error:

======================================================================
ERROR: pyjomap.test.test_mapping (unittest.loader.ModuleImportFailure)
----------------------------------------------------------------------
ImportError: Failed to import test module: pyjomap.test.test_mapping
Traceback (most recent call last):
  File "/opt/homebrew/Cellar/python/2.7.11/Frameworks/Python.framework/Versions/2.7/lib/python2.7/unittest/loader.py", line 254, in _find_tests
    module = self._get_module_from_name(name)
  File "/opt/homebrew/Cellar/python/2.7.11/Frameworks/Python.framework/Versions/2.7/lib/python2.7/unittest/loader.py", line 232, in _get_module_from_name
    __import__(name)
  File "/Users/alan/sources/pyjomap/pyjomap/test/test_mapping.py", line 45, in <module>
    class TestMappingFromDict(TestCase):
  File "/Users/alan/sources/pyjomap/pyjomap/test/test_mapping.py", line 58, in TestMappingFromDict
    MyItem("5", u"whatààà", [{"1": "2"}, {"1": "2"}], {1: "1", 2: "2"}, e=Other("5", "6"))),
  File "/Users/alan/sources/pyjomap/devenv/lib/python2.7/site-packages/genty/genty_dataset.py", line 137, in genty_dataset
    datasets = _build_datasets(*args, **kwargs)
  File "/Users/alan/sources/pyjomap/devenv/lib/python2.7/site-packages/genty/genty_dataset.py", line 169, in _build_datasets
    _add_arg_datasets(datasets, args)
  File "/Users/alan/sources/pyjomap/devenv/lib/python2.7/site-packages/genty/genty_dataset.py", line 195, in _add_arg_datasets
    dataset_strings = [format_arg(data) for data in dataset]
  File "/Users/alan/sources/pyjomap/devenv/lib/python2.7/site-packages/genty/private/__init__.py", line 32, in format_arg
    return translator(value)
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 12: ordinal not in range(128)

All the encodings are properly set in source files; my impression is that genty tries to read the dataset to generate test method names, but makes assumptions on the content of bytestrings; I think it should just skip such data, if it's not able to interpret it.

As a workaround I'm now using the pre-named tests, but I think it's a bug that should be solved whatsoever.