1 files changed, 26 insertions, 13 deletions
diff --git a/Lib/test/test_float.py b/Lib/test/test_float.py
index 24fe128..cb1f6db 100644
--- a/Lib/test/test_float.py
+++ b/Lib/test/test_float.py
@@ -822,6 +822,14 @@ class RoundTestCase(unittest.TestCase):
             test(sfmt, NAN, ' nan')
             test(sfmt, -NAN, ' nan')
 
+    def test_None_ndigits(self):
+        for x in round(1.23), round(1.23, None), round(1.23, ndigits=None):
+            self.assertEqual(x, 1)
+            self.assertIsInstance(x, int)
+        for x in round(1.78), round(1.78, None), round(1.78, ndigits=None):
+            self.assertEqual(x, 2)
+            self.assertIsInstance(x, int)
+
 
 # Beginning with Python 2.6 float has cross platform compatible
 # ways to create and represent inf and nan
@@ -1347,19 +1355,24 @@ class HexFloatTestCase(unittest.TestCase):
             else:
                 self.identical(x, fromHex(toHex(x)))
 
+    def test_subclass(self):
+        class F(float):
+            def __new__(cls, value):
+                return float.__new__(cls, value + 1)
+
+        f = F.fromhex((1.5).hex())
+        self.assertIs(type(f), F)
+        self.assertEqual(f, 2.5)
+
+        class F2(float):
+            def __init__(self, value):
+                self.foo = 'bar'
+
+        f = F2.fromhex((1.5).hex())
+        self.assertIs(type(f), F2)
+        self.assertEqual(f, 1.5)
+        self.assertEqual(getattr(f, 'foo', 'none'), 'bar')
 
-def test_main():
-    support.run_unittest(
-        GeneralFloatCases,
-        FormatFunctionsTestCase,
-        UnknownFormatTestCase,
-        IEEEFormatTestCase,
-        FormatTestCase,
-        ReprTestCase,
-        RoundTestCase,
-        InfNanTest,
-        HexFloatTestCase,
-        )
 
 if __name__ == '__main__':
-    test_main()
+    unittest.main()