Test hooks

[tony]

Changes

• set_layout_hook()

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.71%. Comparing base (423835a) to head (6fe3f32).
⚠️ Report is 891 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #905   +/-   ##
=======================================
  Coverage   70.71%   70.71%           
=======================================
  Files          26       26           
  Lines        1950     1950           
  Branches      407      407           
=======================================
  Hits         1379     1379           
  Misses        448      448           
  Partials      123      123           

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[tony]

Closing as obsolete.

This PR added a stub test for set_layout_hook() (tmuxp/cli/load.py),
but that function was intentionally removed from master in commit
fdda3d7b cli(load): Remove set_layout_hook().
The function the test targeted no longer exists, so the rebased branch
fails mypy with Module "tmuxp.cli.load" has no attribute "set_layout_hook".

If layout-hook coverage is still desired against the current code, it
would be cleaner as a fresh PR against whatever replaced that codepath.