Issue 2235: Py3k warnings are now emitted for classes that will no longer inherit a__hash__ implementation from a parent class in Python 3.x. The standard library and test suite have been updated to not emit these warnings.

Lib/unittest.py

@@ -425,6 +425,9 @@ class TestSuite:
     def __ne__(self, other):
         return not self == other
 
+    # Can't guarantee hash invariant, so flag as unhashable
+    __hash__ = None
+
     def __iter__(self):
         return iter(self._tests)