python-3.6.zip added from Github

README.cosmo contains the necessary links.

third_party/python/Lib/test/test_userstring.py

@@ -0,0 +1,44 @@
+# UserString is a wrapper around the native builtin string type.
+# UserString instances should behave similar to builtin string objects.
+
+import unittest
+from test import string_tests
+
+from collections import UserString
+
+class UserStringTest(
+    string_tests.CommonTest,
+    string_tests.MixinStrUnicodeUserStringTest,
+    unittest.TestCase
+    ):
+
+    type2test = UserString
+
+    # Overwrite the three testing methods, because UserString
+    # can't cope with arguments propagated to UserString
+    # (and we don't test with subclasses)
+    def checkequal(self, result, object, methodname, *args, **kwargs):
+        result = self.fixtype(result)
+        object = self.fixtype(object)
+        # we don't fix the arguments, because UserString can't cope with it
+        realresult = getattr(object, methodname)(*args, **kwargs)
+        self.assertEqual(
+            result,
+            realresult
+        )
+
+    def checkraises(self, exc, obj, methodname, *args):
+        obj = self.fixtype(obj)
+        # we don't fix the arguments, because UserString can't cope with it
+        with self.assertRaises(exc) as cm:
+            getattr(obj, methodname)(*args)
+        self.assertNotEqual(str(cm.exception), '')
+
+    def checkcall(self, object, methodname, *args):
+        object = self.fixtype(object)
+        # we don't fix the arguments, because UserString can't cope with it
+        getattr(object, methodname)(*args)
+
+
+if __name__ == "__main__":
+    unittest.main()