#16306: Fix multiple error messages when unknown command line parameters where passed to the interpreter. Patch by Hieu Nguyen.
diff --git a/Lib/test/test_cmd_line.py b/Lib/test/test_cmd_line.py
index 7d039ee..d8f2443 100644
--- a/Lib/test/test_cmd_line.py
+++ b/Lib/test/test_cmd_line.py
@@ -7,7 +7,8 @@
import sys
import subprocess
import tempfile
-from test.script_helper import spawn_python, kill_python, assert_python_ok, assert_python_failure
+from test.script_helper import (spawn_python, kill_python, assert_python_ok,
+ assert_python_failure)
# XXX (ncoghlan): Move to script_helper and make consistent with run_python
@@ -376,6 +377,12 @@
assert_python_ok(filename)
+ def test_unknown_options(self):
+ rc, out, err = assert_python_failure('-z', __cleanenv=True)
+ self.assertIn(b'Unknown option', err)
+ self.assertEqual(err.splitlines().count(b'Unknown option: -z'), 1)
+ self.assertEqual(b'', out)
+
def test_main():
test.support.run_unittest(CmdLineTest)
test.support.reap_children()