test(test_capture_pane): Remove bashisms (#455)

In an effort to reduce reliance on specific shells so tests
and development works across as many machines as possible,
avoid explicitly mentioning shells. re: #454

There's an issue: What about fish? It departs greatly from
other shells.  Is there a way we can have tests and a capture_pane
that works everywhere? #456

CHANGES

@@ -16,8 +16,12 @@ $ pip install --user --upgrade --pre libtmux
 
 ### Tests
 
+_There will be more tests over the coming weeks and months to shore up
+flakiness across shells and environments._
+
 - Compatibility improvement for `test_capture_pane` and `env` (#452), credit:
   @zappolowski!
+- Remove more BASHisms from tests (#455)
 
 ## libtmux 0.15.9 (2022-10-30)
 

src/libtmux/common.py

@@ -219,7 +219,7 @@ class tmux_cmd:
 
     Equivalent to:
 
-    .. code-block:: bash
+    .. code-block:: console
 
         $ tmux new-session -s my session
 

tests/test_pane.py

@@ -73,7 +73,7 @@ def test_capture_pane(session: Session) -> None:
     session.new_window(
         attach=True,
         window_name="capture_pane",
-        window_shell=f"{env} PS1='$ ' bash --norc --noprofile",
+        window_shell=f"{env} PS1='$ ' sh",
     )
     pane = session.attached_window.attached_pane
     assert pane is not None