Issue #29392: Prevent crash when passing invalid arguments into msvcrt module.

1 files changed, 15 insertions, 0 deletions

diff --git a/Lib/test/test_readline.py b/Lib/test/test_readline.py
index 2c73df291f..06a9149374 100644
--- a/Lib/test/test_readline.py
+++ b/Lib/test/test_readline.py
@@ -121,6 +121,21 @@ class TestReadline(unittest.TestCase):
                                               TERM='xterm-256color')
         self.assertEqual(stdout, b'')
 
+    auto_history_script = """\
+import readline
+readline.set_auto_history({})
+input()
+print("History length:", readline.get_current_history_length())
+"""
+
+    def test_auto_history_enabled(self):
+        output = run_pty(self.auto_history_script.format(True))
+        self.assertIn(b"History length: 1\r\n", output)
+
+    def test_auto_history_disabled(self):
+        output = run_pty(self.auto_history_script.format(False))
+        self.assertIn(b"History length: 0\r\n", output)
+
     def test_nonascii(self):
         try:
             readline.add_history("\xEB\xEF")