diff --git a/testing/test_readline.py b/testing/test_readline.py
index a9a2a2c..e67c019 100644
--- a/testing/test_readline.py
+++ b/testing/test_readline.py
@@ -103,3 +103,15 @@ def replace(cls, *args):
         readline_wrapper.write_history_file(str(histfile))
 
     assert open(str(histfile), "r").readlines() == ["foo\n", "bar\n"]
+
+
+@pytest.mark.parametrize('auto_history,expected', [(True, 1), (False, 0)])
+def test_set_auto_history(auto_history, expected):
+    master, slave = pty.openpty()
+    readline_wrapper = _ReadlineWrapper(slave, slave)
+    readline_wrapper.set_auto_history(auto_history)
+
+    os.write(master, b'input\n')
+    readline_wrapper.get_reader().readline()
+
+    assert readline_wrapper.get_current_history_length() == expected