--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Lib/test/test_json/test_float.py	Thu Aug 08 15:03:45 2013 +0300
@@ -0,0 +1,33 @@
+import math
+from test.test_json import PyTest, CTest
+
+
+class TestFloat:
+    def test_floats(self):
+        for num in [1617161771.7650001, math.pi, math.pi**100, math.pi**-100, 3.1]:
+            self.assertEqual(float(self.dumps(num)), num)
+            self.assertEqual(self.loads(self.dumps(num)), num)
+
+    def test_ints(self):
+        for num in [1, 1<<32, 1<<64]:
+            self.assertEqual(self.dumps(num), str(num))
+            self.assertEqual(int(self.dumps(num)), num)
+
+    def test_out_of_range(self):
+        self.assertEqual(self.loads('[23456789012E666]'), [float('inf')])
+        self.assertEqual(self.loads('[-23456789012E666]'), [float('-inf')])
+
+    def test_allow_nan(self):
+        for val in (float('inf'), float('-inf'), float('nan')):
+            out = self.dumps([val])
+            if val == val:  # inf
+                self.assertEqual(self.loads(out), [val])
+            else:  # nan
+                res = self.loads(out)
+                self.assertEqual(len(res), 1)
+                self.assertNotEqual(res[0], res[0])
+            self.assertRaises(ValueError, self.dumps, [val], allow_nan=False)
+
+
+class TestPyFloat(TestFloat, PyTest): pass
+class TestCFloat(TestFloat, CTest): pass