fix test_unittest: ignore DeprecationWarning on assertDictContainsSubset()
diff --git a/Lib/unittest/test/test_assertions.py b/Lib/unittest/test/test_assertions.py
index e5dc9fa..a1d20eb 100644
--- a/Lib/unittest/test/test_assertions.py
+++ b/Lib/unittest/test/test_assertions.py
@@ -1,5 +1,5 @@
 import datetime
-
+import warnings
 import unittest
 
 
@@ -224,10 +224,13 @@
                              "\+ \{'key': 'value'\} : oops$"])
 
     def testAssertDictContainsSubset(self):
-        self.assertMessages('assertDictContainsSubset', ({'key': 'value'}, {}),
-                            ["^Missing: 'key'$", "^oops$",
-                             "^Missing: 'key'$",
-                             "^Missing: 'key' : oops$"])
+        with warnings.catch_warnings():
+            warnings.simplefilter("ignore", DeprecationWarning)
+
+            self.assertMessages('assertDictContainsSubset', ({'key': 'value'}, {}),
+                                ["^Missing: 'key'$", "^oops$",
+                                 "^Missing: 'key'$",
+                                 "^Missing: 'key' : oops$"])
 
     def testAssertMultiLineEqual(self):
         self.assertMessages('assertMultiLineEqual', ("", "foo"),