diff --git a/test/unit/python/jw/pkg/lib/App/test.py b/test/unit/python/jw/pkg/lib/App/test.py
index 2b899d4f..402f11c5 100644
--- a/test/unit/python/jw/pkg/lib/App/test.py
+++ b/test/unit/python/jw/pkg/lib/App/test.py
@@ -1,10 +1,16 @@
-import asyncio
+from __future__ import annotations
 
+import asyncio
 import sys
 
+from typing import TYPE_CHECKING, override
+
 from jw.pkg.lib.App import App
 from jw.pkg.lib.Cmd import Cmd
 
+if TYPE_CHECKING:
+    from argparse import ArgumentParser, Namespace
+
 # -- A minimal command tree: a root command hosting one child command. The
 # root mimics the "run + opts" unit the App can now mount at the top level:
 # it adds options, sets up, dispatches to the selected child (or runs its own
@@ -12,24 +18,26 @@ from jw.pkg.lib.Cmd import Cmd
 
 class ChildCmd(Cmd):
 
-    def __init__(self, parent):
+    def __init__(self, parent: App | Cmd) -> None:
         super().__init__(parent, 'child', 'A child command')
         self.ran = False
         self.got_opt = None
 
-    def add_arguments(self, parser):
+    @override
+    def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
         parser.add_argument('--child-opt', default = 'child-default')
 
-    async def _run(self, args):
+    @override
+    async def _run(self, args: Namespace) -> None:
         self.ran = True
         self.got_opt = args.child_opt
 
 class RootCmd(Cmd):
 
-    made = []
+    made: list['RootCmd'] = []
 
-    def __init__(self, parent):
+    def __init__(self, parent: App | Cmd) -> None:
         super().__init__(parent, 'root', 'Root command')
         self.child = ChildCmd(self)
         self.add_subcommands(self.child)
@@ -38,11 +46,13 @@ class RootCmd(Cmd):
         self.default = False
         RootCmd.made.append(self)
 
-    def add_arguments(self, parser):
+    @override
+    def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
         parser.add_argument('--root-opt', default = 'root-default')
 
-    async def _run(self, args):
+    @override
+    async def _run(self, args: Namespace) -> None:
         self.setup = True
         try:
             if hasattr(args, 'func'):
diff --git a/test/unit/python/jw/pkg/lib/ExecApp/test.py b/test/unit/python/jw/pkg/lib/ExecApp/test.py
index 3a558946..b0071e56 100644
--- a/test/unit/python/jw/pkg/lib/ExecApp/test.py
+++ b/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
 
diff --git a/test/unit/python/jw/pkg/lib/ProjectConf/test.py b/test/unit/python/jw/pkg/lib/ProjectConf/test.py
index b503a2ec..e2a55cc3 100644
--- a/test/unit/python/jw/pkg/lib/ProjectConf/test.py
+++ b/test/unit/python/jw/pkg/lib/ProjectConf/test.py
@@ -1,5 +1,6 @@
 import os
 import tempfile
+
 from jw.pkg.lib.ProjectConf import ProjectConf
 
 # -- Helper: create temp file and read it --
@@ -13,7 +14,7 @@ def _load(text: str) -> ProjectConf:
         _tmpfiles.append(f.name)
         return ProjectConf.read(f.name)
 
-def _cleanup():
+def _cleanup() -> None:
     for _p in _tmpfiles:
         os.unlink(_p)
         del _p
diff --git a/test/unit/python/jw/pkg/lib/version/test.py b/test/unit/python/jw/pkg/lib/version/test.py
index 07817f87..337219a6 100644
--- a/test/unit/python/jw/pkg/lib/version/test.py
+++ b/test/unit/python/jw/pkg/lib/version/test.py
@@ -233,16 +233,16 @@ for bad in ['', 'foo =', ' = 1.0']:
 # Operators outside the supported set are rejected when parsed,
 # not folded into the package name or deferred to expansion
 for bad in [
-    'foo ~= 1.0',
-    'foo~=1.0',
-    'foo ~ 1.0',
-    'foo != 1.0',
-    'foo!=1.0',
-    'foo == 1.0',
-    'foo==1.0',
-    'foo === 1.0',
-    'foo << 1.0',
-    'foo >> 1.0',
+        'foo ~= 1.0',
+        'foo~=1.0',
+        'foo ~ 1.0',
+        'foo != 1.0',
+        'foo!=1.0',
+        'foo == 1.0',
+        'foo==1.0',
+        'foo === 1.0',
+        'foo << 1.0',
+        'foo >> 1.0',
 ]:
     try:
         Dependency(bad).full_name