1 files changed, 16 insertions, 5 deletions
diff --git a/Lib/test/test_float.py b/Lib/test/test_float.py
index 9d330403..9a67382 100644
--- a/Lib/test/test_float.py
+++ b/Lib/test/test_float.py
@@ -2,12 +2,12 @@
 import unittest, struct
 import os
 from test import test_support
+import math
+from math import isinf, isnan
+import operator
 
-def isinf(x):
-    return x * 0.5 == x
-
-def isnan(x):
-    return x != x
+INF = float("inf")
+NAN = float("nan")
 
 class FormatFunctionsTestCase(unittest.TestCase):
 
@@ -206,6 +206,17 @@ class InfNanTest(unittest.TestCase):
         self.assertEqual(str(1e300 * 1e300 * 0), "nan")
         self.assertEqual(str(-1e300 * 1e300 * 0), "nan")
 
+    def notest_float_nan(self):
+        self.assert_(NAN.is_nan())
+        self.failIf(INF.is_nan())
+        self.failIf((0.).is_nan())
+
+    def notest_float_inf(self):
+        self.assert_(INF.is_inf())
+        self.failIf(NAN.is_inf())
+        self.failIf((0.).is_inf())
+
+
 def test_main():
     test_support.run_unittest(
         FormatFunctionsTestCase,