Issue #7197: Allow unittest.TextTestRunner objects to be pickled and

unpickled. This fixes crashes under Windows when trying to run
test_multiprocessing in verbose mode.

Additionally, Test_TextTestRunner hadn't been enabled in test_unittest.

Lib/unittest/runner.py

@@ -12,6 +12,8 @@ class _WritelnDecorator(object):
         self.stream = stream
 
     def __getattr__(self, attr):
+        if attr == 'stream':
+            raise AttributeError(attr)
         return getattr(self.stream,attr)
 
     def writeln(self, arg=None):