diff --git a/Lib/test/test_multibytecodec.py b/Lib/test/test_multibytecodec.py
index c38df8d..5b61e7e 100644
--- a/Lib/test/test_multibytecodec.py
+++ b/Lib/test/test_multibytecodec.py
@@ -43,6 +43,13 @@
         self.assertRaises(IndexError, dec,
                           'apple\x92ham\x93spam', 'test.cjktest')
 
+    def test_errorcallback_custom_ignore(self):
+        # Issue #23215: MemoryError with custom error handlers and multibyte codecs
+        data = 100 * unichr(0xdc00)
+        codecs.register_error("test.ignore", codecs.ignore_errors)
+        for enc in ALL_CJKENCODINGS:
+            self.assertEqual(data.encode(enc, "test.ignore"), b'')
+
     def test_codingspec(self):
         for enc in ALL_CJKENCODINGS:
             code = '# coding: {}\n'.format(enc)