test: Fix mypy strict errors in unit tests

The unit test files below test/unit/python/jw/pkg/lib/ define Cmd and App
subclasses with unannotated methods: __init__(), add_arguments(), _run()
and close() lack signatures, the made class attribute lacks a type, and the
_cleanup() and exit_context() helpers are untyped, so a strict mypy run
over the test tree fails on them. Likewise, the ExecApp and version tests
carry list formatting that yapf rejects.

Annotate the test classes following the library conventions: parent is App
| Cmd, the parser is ArgumentParser, and args is Namespace, and mark every
overridden method with @override. Guard the imports that are only used for
annotations behind TYPE_CHECKING, and add the future annotations import so
they stay out of the runtime path. Then reformat the test tree with yapf.
That folds the opts list of the ExecApp test and re-indents the rejected
operator list of the version test.

Signed-off-by: Jan Lindemann <jan@janware.com>
Assisted-by: unsloth/Qwen3.8-27B-GGUF:Q4_K_M with pi.dev v0.85.1

test/unit/python/jw/pkg/lib/ExecApp/test.py

@@ -1,18 +1,27 @@
-import asyncio
+from __future__ import annotations
 
+import asyncio
 import sys
 
+from typing import TYPE_CHECKING, override
+
 from jw.pkg.lib.Cmd import Cmd
 from jw.pkg.lib.ExecApp import ExecApp
 
+if TYPE_CHECKING:
+    from argparse import Namespace
+
+    from jw.pkg.lib.App import App
+
 # -- A minimal root command so the app can be built without a command tree.
 
 class RootCmd(Cmd):
 
-    def __init__(self, parent):
+    def __init__(self, parent: App | Cmd) -> None:
         super().__init__(parent, 'root', 'Root command')
 
-    async def _run(self, args):
+    @override
+    async def _run(self, args: Namespace) -> None:
         pass
 
 # -- Counts the close() calls made by App.__aexit__() when the async context
@@ -22,7 +31,8 @@ class RecordingExecApp(ExecApp):
 
     closed = 0
 
-    def close(self):
+    @override
+    def close(self) -> None:
         RecordingExecApp.closed += 1
         super().close()
 
@@ -38,16 +48,14 @@ finally:
 
 # -- ExecApp registers the exec-related options on the top-level parser.
 
-opts = [
-    o for a in app.parser._actions for o in getattr(a, 'option_strings', ())
-]
+opts = [o for a in app.parser._actions for o in getattr(a, 'option_strings', ())]
 for opt in ('--interactive', '--verbose', '--target'):
     assert opt in opts, f'{opt} must be registered by ExecApp'
 
 # -- Exiting the async context must close the app, through the
 # App.__aexit__() that ExecApp.__aexit__() chains to.
 
-async def exit_context():
+async def exit_context() -> None:
     async with app:
         pass