gh-80480: Emit DeprecationWarning for array's 'u' type code (#95760)

1 files changed, 10 insertions, 6 deletions

diff --git a/Lib/test/test_buffer.py b/Lib/test/test_buffer.py
index 94fc9d4..8d6902e 100644
--- a/Lib/test/test_buffer.py
+++ b/Lib/test/test_buffer.py
@@ -24,6 +24,7 @@ import warnings
 import sys, array, io, os
 from decimal import Decimal
 from fractions import Fraction
+from test.support import warnings_helper
 
 try:
     from _testbuffer import *
@@ -3217,12 +3218,6 @@ class TestBufferProtocol(unittest.TestCase):
         nd[0] = (-1, float('nan'))
         self.assertNotEqual(memoryview(nd), nd)
 
-        # Depends on issue #15625: the struct module does not understand 'u'.
-        a = array.array('u', 'xyz')
-        v = memoryview(a)
-        self.assertNotEqual(a, v)
-        self.assertNotEqual(v, a)
-
         # Some ctypes format strings are unknown to the struct module.
         if ctypes:
             # format: "T{>l:x:>l:y:}"
@@ -3236,6 +3231,15 @@ class TestBufferProtocol(unittest.TestCase):
             self.assertNotEqual(point, a)
             self.assertRaises(NotImplementedError, a.tolist)
 
+    @warnings_helper.ignore_warnings(category=DeprecationWarning)  # gh-80480 array('u')
+    def test_memoryview_compare_special_cases_deprecated_u_type_code(self):
+
+        # Depends on issue #15625: the struct module does not understand 'u'.
+        a = array.array('u', 'xyz')
+        v = memoryview(a)
+        self.assertNotEqual(a, v)
+        self.assertNotEqual(v, a)
+
     def test_memoryview_compare_ndim_zero(self):
 
         nd1 = ndarray(1729, shape=[], format='@L')