from importlib import machinery
from .. import abc
from . import util

import unittest

class FinderTests(abc.FinderTests):

    """Test the finder for extension modules."""

    def find_module(self, fullname):
        importer = machinery.FileFinder(util.PATH,
                                        (machinery.ExtensionFileLoader,
                                         machinery.EXTENSION_SUFFIXES))
        return importer.find_module(fullname)

    def test_module(self):
        self.assertTrue(self.find_module(util.NAME))

    # No extension module as an __init__ available for testing.
    test_package = test_package_in_package = None

    # No extension module in a package available for testing.
    test_module_in_package = None

    # Extension modules cannot be an __init__ for a package.
    test_package_over_module = None

    def test_failure(self):
        self.assertIsNone(self.find_module('asdfjkl;'))


def test_main():
    from test.support import run_unittest
    run_unittest(FinderTests)


if __name__ == '__main__':
    test_main()