python-3.6.zip added from Github

README.cosmo contains the necessary links.

third_party/python/Lib/test/test_errno.py

@@ -0,0 +1,35 @@
+"""Test the errno module
+   Roger E. Masse
+"""
+
+import errno
+import unittest
+
+std_c_errors = frozenset(['EDOM', 'ERANGE'])
+
+class ErrnoAttributeTests(unittest.TestCase):
+
+    def test_for_improper_attributes(self):
+        # No unexpected attributes should be on the module.
+        for error_code in std_c_errors:
+            self.assertTrue(hasattr(errno, error_code),
+                            "errno is missing %s" % error_code)
+
+    def test_using_errorcode(self):
+        # Every key value in errno.errorcode should be on the module.
+        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()