Issue #15814: Use hash function that is compatible with the equality
definition from #15573.
diff --git a/Lib/test/test_buffer.py b/Lib/test/test_buffer.py
index 26cd9be..977b282 100644
--- a/Lib/test/test_buffer.py
+++ b/Lib/test/test_buffer.py
@@ -3999,14 +3999,42 @@
m = memoryview(x)
self.assertEqual(hash(m), hash(x))
+ # equality-hash invariant
+ x = ndarray(list(range(12)), shape=[12], format='B')
+ a = memoryview(nd)
+
+ y = ndarray(list(range(12)), shape=[12], format='b')
+ b = memoryview(nd)
+
+ z = ndarray(list(bytes(chr(x), 'latin-1') for x in range(12)),
+ shape=[12], format='c')
+ c = memoryview(nd)
+
+ if (a == b):
+ self.assertEqual(hash(a), hash(b))
+
+ if (a == c):
+ self.assertEqual(hash(a), hash(c))
+
+ if (b == c):
+ self.assertEqual(hash(b), hash(c))
+
# non-byte formats
nd = ndarray(list(range(12)), shape=[2,2,3], format='L')
m = memoryview(nd)
- self.assertEqual(hash(m), hash(nd.tobytes()))
+ self.assertRaises(ValueError, m.__hash__)
nd = ndarray(list(range(-6, 6)), shape=[2,2,3], format='h')
m = memoryview(nd)
- self.assertEqual(hash(m), hash(nd.tobytes()))
+ self.assertRaises(ValueError, m.__hash__)
+
+ nd = ndarray(list(range(12)), shape=[2,2,3], format='= L')
+ m = memoryview(nd)
+ self.assertRaises(ValueError, m.__hash__)
+
+ nd = ndarray(list(range(-6, 6)), shape=[2,2,3], format='< h')
+ m = memoryview(nd)
+ self.assertRaises(ValueError, m.__hash__)
def test_memoryview_release(self):