Add regression test (#6452)

ShaharNaveh · web-flow · commit 9d2dd1745565 · 2025-12-17T19:02:44.000+09:00
diff --git a/extra_tests/snippets/builtin_bytes.py b/extra_tests/snippets/builtin_bytes.py
@@ -1,3 +1,5 @@
+import sys
+
 from testutils import assert_raises, skip_if_unsupported
 
 # new
@@ -611,6 +613,9 @@
 assert b"\xc2\xae\x75\x73\x74".decode() == "®ust"
 assert b"\xe4\xb8\xad\xe6\x96\x87\xe5\xad\x97".decode("utf-8") == "中文字"
 
+# gh-2391
+assert b"-\xff".decode(sys.getfilesystemencoding(), "surrogateescape") == "-\udcff"
+
 # mod
 assert b"rust%bpython%b" % (b" ", b"!") == b"rust python!"
 assert b"x=%i y=%f" % (1, 2.5) == b"x=1 y=2.500000"
