Refs #33060 -- Added memcached test for make_key() making keys invalid.

tests/cache/tests.py

@@ -1417,6 +1417,15 @@ class BaseMemcachedTests(BaseCacheTests):
                     getattr(cache, operation)(*args)
                 self.assertEqual(str(cm.exception), msg)
 
+    def test_invalid_with_version_key_length(self):
+        # make_key() adds a version to the key and exceeds the limit.
+        key = 'a' * 248
+        expected_warning = (
+            'Cache key will cause errors if used with memcached: '
+            '%r (longer than %s)' % (key, 250)
+        )
+        self._perform_invalid_key_test(key, expected_warning)
+
     def test_default_never_expiring_timeout(self):
         # Regression test for #22845
         with self.settings(CACHES=caches_setting_for_tests(