An exec or Tty from a pane whose directory is a peer's path refuses before making any pane: `exec: <dir>: no such directory`, no `exit 127` pane left

A peer's directory (`/n/peer/x`) is no directory on this host, where the
shell starts, so a command there ran in a pane that could only say
`(pwd) exit 127`, and a Tty made a new/del pair. missingDir now counts
such a path missing, as it does a local directory that is not there.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

1 files changed, 10 insertions, 0 deletions

diff --git a/test/fs.py b/test/fs.py
index 0e1e44df..424a67e2 100644
--- a/test/fs.py
+++ b/test/fs.py
@@ -467,6 +467,16 @@ def run_file(binary):
     with tempfile.TemporaryDirectory() as directory:
         root = Path(directory)
         with session(binary, root, 'run') as (client, address):
+            # From a pane on a peer's path no command or terminal starts:
+            # refused before any pane is made, no `exit 127` pane left.
+            peer = new_pane(client, b'')
+            client.write(f'/pane/{peer}/name', b'/n/nosuchpeer/d/f.txt\n')
+            count = len(client.read('/index').splitlines())
+            execute_refused(client, peer, 'ls', 'no such directory')
+            execute_refused(client, peer, 'Tty', 'no such directory')
+            assert len(client.read('/index').splitlines()) == count, client.read('/index')
+            assert b'exit 127' not in client.read('/log')
+            client.remove(f'/pane/{peer}')
             client.write('/exec', b'Shell bash\n')
             client.write('/exec', b'Tty\n')
             term = int(max(r.split()[0] for r in client.read('/index').splitlines() if r.split()[1] == b'term'))