1 files changed, 3 insertions, 0 deletions
diff --git a/test/fs.py b/test/fs.py
index f954b508..97af9e6b 100644
--- a/test/fs.py
+++ b/test/fs.py
@@ -1595,6 +1595,9 @@ def test(binary, quic=False):
             dead_env = dict(outside_env, PARDES_9P=str(root / 'pardes-9p-gone.sock'))
             gone = subprocess.run([binary, '--wait', str(far)], cwd=root, env=dead_env, capture_output=True, timeout=10)
             assert gone.returncode == 1 and b'does not answer' in gone.stderr, gone
+            # --wait with no FILE says it needs one, and waits on nothing.
+            bare = subprocess.run([binary, '--wait'], cwd=root, env=env, capture_output=True, timeout=10)
+            assert bare.returncode == 1 and b'--wait needs a FILE' in bare.stderr, bare
             # `--` ends the options: a name starting with a dash is a name.
             dash = root / '-dash.txt'
             dash.write_bytes(b'dash\n')