[3.13] pythongh-123811: test that round() can return signed zero (pythonGH-123829) (python#123938)

miss-islington · skirpichev · web-flow · commit 243db20b75e6 · 2024-09-29T21:22:13.000-07:00
pythongh-123811: test that round() can return signed zero (pythonGH-123829) (cherry picked from commit d2b9b6f) Co-authored-by: Sergey B Kirpichev <skirpichev@gmail.com>
diff --git a/Lib/test/test_float.py b/Lib/test/test_float.py
@@ -830,7 +830,7 @@ def test_short_repr(self):
             self.assertEqual(repr(float(negs)), str(float(negs)))
 
 @support.requires_IEEE_754
-class RoundTestCase(unittest.TestCase):
+class RoundTestCase(unittest.TestCase, FloatsAreIdenticalMixin):
 
     def test_inf_nan(self):
         self.assertRaises(OverflowError, round, INF)
@@ -860,10 +860,10 @@ def test_large_n(self):
 
     def test_small_n(self):
         for n in [-308, -309, -400, 1-2**31, -2**31, -2**31-1, -2**100]:
-            self.assertEqual(round(123.456, n), 0.0)
-            self.assertEqual(round(-123.456, n), -0.0)
-            self.assertEqual(round(1e300, n), 0.0)
-            self.assertEqual(round(1e-320, n), 0.0)
+            self.assertFloatsAreIdentical(round(123.456, n), 0.0)
+            self.assertFloatsAreIdentical(round(-123.456, n), -0.0)
+            self.assertFloatsAreIdentical(round(1e300, n), 0.0)
+            self.assertFloatsAreIdentical(round(1e-320, n), 0.0)
 
     def test_overflow(self):
         self.assertRaises(OverflowError, round, 1.6e308, -308)
