Issue 10326: Fix regression to get test cases to pickle again.

Lib/unittest/case.py

@@ -129,6 +129,27 @@ class _AssertRaisesContext(object):
         return True
 
 
+class _TypeEqualityDict(object):
+
+    def __init__(self, testcase):
+        self.testcase = testcase
+        self._store = {}
+
+    def __setitem__(self, key, value):
+        self._store[key] = value
+
+    def __getitem__(self, key):
+        value = self._store[key]
+        if isinstance(value, basestring):
+            return getattr(self.testcase, value)
+        return value
+
+    def get(self, key, default=None):
+        if key in self._store:
+            return self[key]
+        return default
+
+
 class TestCase(object):
     """A class whose instances are single test cases.
 
@@ -195,13 +216,13 @@ class TestCase(object):
         # Map types to custom assertEqual functions that will compare
         # instances of said type in more detail to generate a more useful
         # error message.
-        self._type_equality_funcs = {}
-        self.addTypeEqualityFunc(dict, self.assertDictEqual)
-        self.addTypeEqualityFunc(list, self.assertListEqual)
-        self.addTypeEqualityFunc(tuple, self.assertTupleEqual)
-        self.addTypeEqualityFunc(set, self.assertSetEqual)
-        self.addTypeEqualityFunc(frozenset, self.assertSetEqual)
-        self.addTypeEqualityFunc(unicode, self.assertMultiLineEqual)
+        self._type_equality_funcs = _TypeEqualityDict(self)
+        self.addTypeEqualityFunc(dict, 'assertDictEqual')
+        self.addTypeEqualityFunc(list, 'assertListEqual')
+        self.addTypeEqualityFunc(tuple, 'assertTupleEqual')
+        self.addTypeEqualityFunc(set, 'assertSetEqual')
+        self.addTypeEqualityFunc(frozenset, 'assertSetEqual')
+        self.addTypeEqualityFunc(unicode, 'assertMultiLineEqual')
 
     def addTypeEqualityFunc(self, typeobj, function):
         """Add a type specific assertEqual style function to compare a type.

Lib/unittest/test/test_case.py

 import difflib
 import pprint
+import pickle
 import re
 import sys
 
@@ -1104,6 +1105,20 @@ test case
             self.assertEqual(len(result.errors), 1)
             self.assertEqual(result.testsRun, 1)
 
+    def testPickle(self):
+        # Issue 10326
+
+        # Can't use TestCase classes defined in Test class as
+        # pickle does not work with inner classes
+        test = unittest.TestCase('run')
+        for protocol in range(pickle.HIGHEST_PROTOCOL + 1):
+
+            # blew up prior to fix
+            pickled_test = pickle.dumps(test, protocol=protocol)
+
+            unpickled_test = pickle.loads(pickled_test)
+            self.assertEqual(test, unpickled_test)
+
 
 if __name__ == '__main__':
     unittest.main()