bpo-43475: Fix the Python implementation of hash of Decimal NaN (GH-26679)

1 files changed, 19 insertions, 0 deletions

diff --git a/Lib/test/test_float.py b/Lib/test/test_float.py
index ff4f387..f0ed40f 100644
--- a/Lib/test/test_float.py
+++ b/Lib/test/test_float.py
@@ -564,6 +564,25 @@ class GeneralFloatCases(unittest.TestCase):
             #self.assertTrue(0.0 < pow_op(2.0, -1047) < 1e-315)
             #self.assertTrue(0.0 > pow_op(-2.0, -1047) > -1e-315)
 
+    def test_hash(self):
+        for x in range(-30, 30):
+            self.assertEqual(hash(float(x)), hash(x))
+        self.assertEqual(hash(float(sys.float_info.max)),
+                         hash(int(sys.float_info.max)))
+        self.assertEqual(hash(float('inf')), sys.hash_info.inf)
+        self.assertEqual(hash(float('-inf')), -sys.hash_info.inf)
+
+    def test_hash_nan(self):
+        value = float('nan')
+        self.assertEqual(hash(value), object.__hash__(value))
+        class H:
+            def __hash__(self):
+                return 42
+        class F(float, H):
+            pass
+        value = F('nan')
+        self.assertEqual(hash(value), object.__hash__(value))
+
 
 @requires_setformat
 class FormatFunctionsTestCase(unittest.TestCase):