1 files changed, 25 insertions, 8 deletions

diff --git a/Lib/test/test_pickle.py b/Lib/test/test_pickle.py
index ee7a667d06..d467d52bad 100644
--- a/Lib/test/test_pickle.py
+++ b/Lib/test/test_pickle.py
@@ -14,6 +14,7 @@ from test.pickletester import AbstractUnpickleTests
 from test.pickletester import AbstractPickleTests
 from test.pickletester import AbstractPickleModuleTests
 from test.pickletester import AbstractPersistentPicklerTests
+from test.pickletester import AbstractIdentityPersistentPicklerTests
 from test.pickletester import AbstractPicklerUnpicklerObjectTests
 from test.pickletester import AbstractDispatchTableTests
 from test.pickletester import BigmemPickleTests
@@ -82,10 +83,7 @@ class InMemoryPickleTests(AbstractPickleTests, AbstractUnpickleTests,
         return pickle.loads(buf, **kwds)
 
 
-class PyPersPicklerTests(AbstractPersistentPicklerTests):
-
-    pickler = pickle._Pickler
-    unpickler = pickle._Unpickler
+class PersistentPicklerUnpicklerMixin(object):
 
     def dumps(self, arg, proto=None):
         class PersPickler(self.pickler):
@@ -94,8 +92,7 @@ class PyPersPicklerTests(AbstractPersistentPicklerTests):
         f = io.BytesIO()
         p = PersPickler(f, proto)
         p.dump(arg)
-        f.seek(0)
-        return f.read()
+        return f.getvalue()
 
     def loads(self, buf, **kwds):
         class PersUnpickler(self.unpickler):
@@ -106,6 +103,20 @@ class PyPersPicklerTests(AbstractPersistentPicklerTests):
         return u.load()
 
 
+class PyPersPicklerTests(AbstractPersistentPicklerTests,
+                         PersistentPicklerUnpicklerMixin):
+
+    pickler = pickle._Pickler
+    unpickler = pickle._Unpickler
+
+
+class PyIdPersPicklerTests(AbstractIdentityPersistentPicklerTests,
+                           PersistentPicklerUnpicklerMixin):
+
+    pickler = pickle._Pickler
+    unpickler = pickle._Unpickler
+
+
 class PyPicklerUnpicklerObjectTests(AbstractPicklerUnpicklerObjectTests):
 
     pickler_class = pickle._Pickler
@@ -144,6 +155,10 @@ if has_c_implementation:
         pickler = _pickle.Pickler
         unpickler = _pickle.Unpickler
 
+    class CIdPersPicklerTests(PyIdPersPicklerTests):
+        pickler = _pickle.Pickler
+        unpickler = _pickle.Unpickler
+
     class CDumpPickle_LoadPickle(PyPicklerTests):
         pickler = _pickle.Pickler
         unpickler = pickle._Unpickler
@@ -409,11 +424,13 @@ class CompatPickleTests(unittest.TestCase):
 
 
 def test_main():
-    tests = [PickleTests, PyUnpicklerTests, PyPicklerTests, PyPersPicklerTests,
+    tests = [PickleTests, PyUnpicklerTests, PyPicklerTests,
+             PyPersPicklerTests, PyIdPersPicklerTests,
              PyDispatchTableTests, PyChainDispatchTableTests,
              CompatPickleTests]
     if has_c_implementation:
-        tests.extend([CUnpicklerTests, CPicklerTests, CPersPicklerTests,
+        tests.extend([CUnpicklerTests, CPicklerTests,
+                      CPersPicklerTests, CIdPersPicklerTests,
                       CDumpPickle_LoadPickle, DumpPickle_CLoadPickle,
                       PyPicklerUnpicklerObjectTests,
                       CPicklerUnpicklerObjectTests,