test the errno module roger e masse no unexpected attributes should be on the module every key value in errno errorcode should be on the module no unexpected attributes should be on the module every key value in errno errorcode should be on the module
import errno
import unittest

std_c_errors = frozenset(['EDOM', 'ERANGE'])

class ErrnoAttributeTests(unittest.TestCase):

    def test_for_improper_attributes(self):
        
        for error_code in std_c_errors:
            self.assertTrue(hasattr(errno, error_code),
                            "errno is missing %s" % error_code)

    def test_using_errorcode(self):
        
        for value in errno.errorcode.values():
            self.assertTrue(hasattr(errno, value),
                            'no %s attr in errno' % value)


class ErrorcodeTests(unittest.TestCase):

    def test_attributes_in_errorcode(self):
        for attribute in errno.__dict__.keys():
            if attribute.isupper():
                self.assertIn(getattr(errno, attribute), errno.errorcode,
                              'no %s attr in errno.errorcode' % attribute)


if __name__ == '__main__':
    unittest.main()