diff -r 9bee1fd64ee6 Lib/test/test_format.py
--- a/Lib/test/test_format.py	Mon Aug 05 10:59:36 2013 +0100
+++ b/Lib/test/test_format.py	Mon Aug 05 23:10:51 2013 +0800
@@ -3,6 +3,7 @@
 import sys
 import test.support as support
 import unittest
+from _testcapi import INT_MAX
 
 maxsize = support.MAX_Py_ssize_t
 
@@ -327,13 +328,7 @@
         self.assertIs(text % (), text)
         self.assertIs(text.format(), text)
 
-
-def test_main():
-    support.run_unittest(FormatTest)
-
     def test_precision(self):
-        INT_MAX = 2147483647
-
         f = 1.2
         self.assertEqual(format(f, ".0f"), "1")
         self.assertEqual(format(f, ".3f"), "1.200")
@@ -342,10 +337,10 @@
         self.assertEqual(str(cm.exception), "precision too big")
 
         c = complex(f)
-        self.assertEqual(format(f, ".0f"), "1")
-        self.assertEqual(format(f, ".3f"), "1.200")
+        self.assertEqual(format(c, ".0f"), "1+0j")
+        self.assertEqual(format(c, ".3f"), "1.200+0.000j")
         with self.assertRaises(ValueError) as cm:
-            format(f, ".%sf" % (INT_MAX + 1))
+            format(c, ".%sf" % (INT_MAX + 1))
         self.assertEqual(str(cm.exception), "precision too big")