Check PendingDeprecationWarning after issue #7994.
diff --git a/Lib/test/test_str.py b/Lib/test/test_str.py
index fa86db4..4f88b28 100644
--- a/Lib/test/test_str.py
+++ b/Lib/test/test_str.py
@@ -276,7 +276,7 @@
         # format specifiers for user defined type
         self.assertEqual('{0:abc}'.format(C()), 'abc')
 
-        # !r and !s coersions
+        # !r and !s coercions
         self.assertEqual('{0!s}'.format('Hello'), 'Hello')
         self.assertEqual('{0!s:}'.format('Hello'), 'Hello')
         self.assertEqual('{0!s:15}'.format('Hello'), 'Hello          ')
@@ -290,12 +290,15 @@
         self.assertEqual('{0}'.format([]), '[]')
         self.assertEqual('{0}'.format([1]), '[1]')
         self.assertEqual('{0}'.format(E('data')), 'E(data)')
-        self.assertEqual('{0:^10}'.format(E('data')), ' E(data)  ')
-        self.assertEqual('{0:^10s}'.format(E('data')), ' E(data)  ')
         self.assertEqual('{0:d}'.format(G('data')), 'G(data)')
-        self.assertEqual('{0:>15s}'.format(G('data')), ' string is data')
         self.assertEqual('{0!s}'.format(G('data')), 'string is data')
 
+        msg = 'object.__format__ with a non-empty format string is deprecated'
+        with test_support.check_warnings((msg, PendingDeprecationWarning)):
+            self.assertEqual('{0:^10}'.format(E('data')), ' E(data)  ')
+            self.assertEqual('{0:^10s}'.format(E('data')), ' E(data)  ')
+            self.assertEqual('{0:>15s}'.format(G('data')), ' string is data')
+
         self.assertEqual("{0:date: %Y-%m-%d}".format(I(year=2007,
                                                        month=8,
                                                        day=27)),