1 files changed, 8 insertions, 0 deletions
diff --git a/test/fs.py b/test/fs.py
index 2782407d..8d830c48 100644
--- a/test/fs.py
+++ b/test/fs.py
@@ -1306,6 +1306,14 @@ def test(binary, quic=False):
         # opened is deleted, as an $EDITOR must; one on a file already open
         # waits on that pane; a session that goes away ends it with 1.
         with session(binary, root, 'wait') as (client, address):
+            # A second --detach of a name a live session holds: said, exit 1,
+            # no Zig error trace.
+            second_env = {k: v for k, v in os.environ.items() if not k.startswith('PARDES_')}
+            second_env.update(HOME=str(root), XDG_RUNTIME_DIR=str(root))
+            second = subprocess.run([binary, '--detach=wait'], cwd=root, env=second_env,
+                                    stdout=subprocess.DEVNULL, stderr=subprocess.PIPE, timeout=20)
+            assert second.returncode == 1, second
+            assert second.stderr == b'pardes: a session named wait is already running\n', second.stderr
             status = dict(line.split(maxsplit=1) for line in client.read('/status').decode().splitlines())
             env = {k: v for k, v in os.environ.items() if k != 'PARDES_FORWARD_LOOK'}
             env.update(PARDES_9P=str(address), PARDES_PANE='1', PARDES_PID=status['pid'])