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Como resolver 'Can't perform this operation for unregistered loader type'

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Problema

Recentemente eu comecei a adicionar unit tests usando setuptools a um dos meus packages.

A fim de fazer isso, eu adicionei um diretório test contendo MyUnitTest.py. setup.py estava propriamente setup usando a

setup.py
test_suite="tests"

opção.

No entanto, ao rodar

run_tests.sh
python setup.py test

eu obtive esta mensagem de erro:

setup_output.txt
running test
running egg_info
writing MyPackage.egg-info/PKG-INFO
writing top-level names to MyPackage.egg-info/top_level.txt
writing dependency_links to MyPackage.egg-info/dependency_links.txt
reading manifest file 'MyPackage.egg-info/SOURCES.txt'
reading manifest template 'MANIFEST.in'
writing manifest file 'MyPackage.egg-info/SOURCES.txt'
running build_ext
Traceback (most recent call last):
  File "setup.py", line 29, in <module>
    'Topic :: Scientific/Engineering :: Information Analysis'
  File "/usr/lib/python3.4/distutils/core.py", line 148, in setup
    dist.run_commands()
  File "/usr/lib/python3.4/distutils/dist.py", line 955, in run_commands
    self.run_command(cmd)
  File "/usr/lib/python3.4/distutils/dist.py", line 974, in run_command
    cmd_obj.run()
  File "/usr/lib/python3/dist-packages/setuptools/command/test.py", line 135, in run
    self.with_project_on_sys_path(self.run_tests)
  File "/usr/lib/python3/dist-packages/setuptools/command/test.py", line 116, in with_project_on_sys_path
    func()
  File "/usr/lib/python3/dist-packages/setuptools/command/test.py", line 160, in run_tests
    testLoader = cks
  File "/usr/lib/python3.4/unittest/main.py", line 92, in __init__
    self.parseArgs(argv)
  File "/usr/lib/python3.4/unittest/main.py", line 139, in parseArgs
    self.createTests()
  File "/usr/lib/python3.4/unittest/main.py", line 146, in createTests
    self.module)
  File "/usr/lib/python3.4/unittest/loader.py", line 146, in loadTestsFromNames
    suites = [self.loadTestsFromName(name, module) for name in names]
  File "/usr/lib/python3.4/unittest/loader.py", line 146, in <listcomp>
    suites = [self.loadTestsFromName(name, module) for name in names]
  File "/usr/lib/python3.4/unittest/loader.py", line 117, in loadTestsFromName
    return self.loadTestsFromModule(obj)
  File "/usr/lib/python3/dist-packages/setuptools/command/test.py", line 26, in loadTestsFromModule
    for file in resource_listdir(module.__name__, ''):
  File "/usr/lib/python3/dist-packages/pkg_resources.py", line 954, in resource_listdir
    resource_name
  File "/usr/lib/python3/dist-packages/pkg_resources.py", line 1378, in resource_listdir
    return self._listdir(self._fn(self.module_path,resource_name))
  File "/usr/lib/python3/dist-packages/pkg_resources.py", line 1415, in _listdir
    "Can't perform this operation for unregistered loader type"
NotImplementedError: Can't perform this operation for unregistered loader type

Solução

A questão é que seu diretório tests (e possivelmente quaisquer subdiretórios) não é um módulo Python.

A fim de corrigir isso, adicione um arquivo __init__.py ao diretório tests (e possivelmente quaisquer subdiretórios). A fim de resolver a questão delineada acima, ele não precisa de qualquer conteúdo

create_init.sh
touch tests/__init__.py

Após isso, você deve ser capaz de rodar python setup.py test com sucesso.

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