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.
diff --git a/Misc/NEWS b/Misc/NEWS
index 57183e1..e3638aa 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -426,6 +426,10 @@
 Library
 -------
 
+- 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.
+
 - Issue #7282: Fix a memory leak when an RLock was used in a thread other
   than those started through `threading.Thread` (for example, using
   `thread.start_new_thread()`.