Forwarding pardes @pN for a pane the session has not is refused, "this session has no such pane", exit 1 and no pane made; one it has is looked at

@p999:1 was taken as a new file's name, so a pane named <cwd>/@p999 was
made and the launch succeeded; an @pN the session did have was the same
stray pane. A pane address is now checked against the session: one it
has is a look at it, one it has not is refused with the reason and exit
1, as a refused name is.

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

1 files changed, 9 insertions, 2 deletions

diff --git a/test/fs.py b/test/fs.py
index eba5a5fa..7061c61f 100644
--- a/test/fs.py
+++ b/test/fs.py
@@ -1391,14 +1391,21 @@ def test(binary, quic=False):
             assert refused.returncode == 1, refused
             assert b'bad character in file name' in refused.stderr, refused.stderr
             assert serials() == before, (serials(), before)
-            # A name with a newline is said in words, not an error's name.
-            for word, said in (('two\nlines.txt', b'a file name is one line'),):
+            # A pane address the session has not is refused in words, exit
+            # 1, no pane made for a file of that name; one it has is looked
+            # at. A name with a newline is said in words, not an error name.
+            for word, said in (('@p999:1', b'pardes: @p999:1: this session has no such pane'),
+                               ('two\nlines.txt', b'a file name is one line')):
                 refused = subprocess.run([binary, word], cwd=root, env=env,
                                          stdout=subprocess.PIPE, stderr=subprocess.PIPE, timeout=10)
                 assert refused.returncode == 1, refused
                 assert said in refused.stderr, refused.stderr
                 assert b'NotOneLine' not in refused.stderr and b'NoSuchPane' not in refused.stderr
                 assert serials() == before, (serials(), before)
+            looked = subprocess.run([binary, '@p1:1'], cwd=root, env=env,
+                                    stdout=subprocess.PIPE, stderr=subprocess.PIPE, timeout=10)
+            assert looked.returncode == 0, looked.stderr
+            assert serials() == before, (serials(), before)
             orphan = launch('--wait')
             assert orphan.poll() is None
         assert orphan.wait(timeout=5) == 1