diff -r 65f2c92ed079 Lib/test/pickletester.py
--- a/Lib/test/pickletester.py	Sun Jul 07 23:30:24 2013 +0200
+++ b/Lib/test/pickletester.py	Mon Jul 08 14:41:06 2013 +1000
@@ -1242,6 +1242,30 @@
             else:
                 self._check_pickling_with_opcode(obj, pickle.SETITEMS, proto)
 
+    def test_negative_version(self):
+        f = io.BytesIO()
+        p = pickle._Pickler(f, -1)
+        expected = pickle.DEFAULT_PROTOCOL
+        got = p.proto
+        self.assertEqual(expected, got)
+
+    def test_non_existent_version(self):
+        f = io.BytesIO()
+        with self.assertRaises(ValueError):
+            p = pickle._Pickler(f, pickle.HIGHEST_PROTOCOL+1)
+
+    def test_invalid_file(self):
+        f = ""
+        with self.assertRaises(TypeError):
+            p = pickle._Pickler(f)
+
+    def test_no_write_method_on_dump(self):
+        f = io.BytesIO()
+        p = pickle._Pickler(f)
+        del p.write
+        with self.assertRaises(pickle.PicklingError):
+            p.dump("")
+
 
 class BigmemPickleTests(unittest.TestCase):