fix(tests): resolve pyright errors in stale-check test files

Remove unused imports, add missing type annotations, fix Die()
constructor calls (int code, not str), replace fake backend
subclass with patch.object approach to avoid reportMissingParameterType
and override-incompatibility errors in strict pyright mode.

tests/unit/test_cli_start_stale.py

@@ -8,14 +8,12 @@ Exercises the while-True / try-except loop around backend.launch:
 
 from __future__ import annotations
 
-import contextlib
 import io
 import tempfile
 import unittest
-from pathlib import Path
 from types import SimpleNamespace
 from typing import Any, cast
-from unittest.mock import MagicMock, call, patch
+from unittest.mock import MagicMock, patch
 
 from bot_bottle.image_cache import StaleImageError
 from bot_bottle.log import Die
@@ -47,10 +45,10 @@ def _ok_cm(bottle: Any) -> MagicMock:
 
 
 class TestLaunchBottleStaleHandling(unittest.TestCase):
-    def setUp(self):
+    def setUp(self) -> None:
         self._tmp = tempfile.mkdtemp(prefix="cli-stale-test.")
 
-    def _spec(self):
+    def _spec(self) -> Any:
         from bot_bottle.backend import BottleSpec
         from bot_bottle.manifest import ManifestIndex
         idx = ManifestIndex.from_json_obj({
@@ -65,7 +63,7 @@ class TestLaunchBottleStaleHandling(unittest.TestCase):
             identity="dev-abc",
         )
 
-    def _run_launch(self, **patch_kwargs) -> int:
+    def _run_launch(self, **patch_kwargs: Any) -> int:
         import bot_bottle.cli.start as start_mod
         spec = self._spec()
         with patch.object(start_mod, "prepare_with_preflight",
@@ -79,7 +77,7 @@ class TestLaunchBottleStaleHandling(unittest.TestCase):
                 **patch_kwargs,
             )
 
-    def test_headless_stale_calls_die(self):
+    def test_headless_stale_calls_die(self) -> None:
         """In headless mode (assume_yes=True), a StaleImageError must call die()."""
         import bot_bottle.cli.start as start_mod
 
@@ -87,11 +85,11 @@ class TestLaunchBottleStaleHandling(unittest.TestCase):
         backend_mock.launch.return_value = _stale_cm()
 
         with patch.object(start_mod, "get_bottle_backend", return_value=backend_mock), \
-             patch.object(start_mod, "die", side_effect=Die("stale")):
+             patch.object(start_mod, "die", side_effect=Die()):
             with self.assertRaises(Die):
                 self._run_launch(assume_yes=True)
 
-    def test_interactive_user_declines_stops_loop(self):
+    def test_interactive_user_declines_stops_loop(self) -> None:
         """Interactive user answering 'n' → loop exits without a second launch."""
         import bot_bottle.cli.start as start_mod
 
@@ -107,16 +105,14 @@ class TestLaunchBottleStaleHandling(unittest.TestCase):
         # launch was called once (stale), then the user declined → no second call.
         backend_mock.launch.assert_called_once()
 
-    def test_interactive_user_confirms_retries_with_skip_stale(self):
+    def test_interactive_user_confirms_retries_with_skip_stale(self) -> None:
         """Interactive user answering 'y' → second launch with skip_stale=True."""
         import bot_bottle.cli.start as start_mod
 
         bottle_mock = MagicMock()
         bottle_mock.name = "dev-abc"
 
-        stale_calls = [0]
-
-        def launch_side_effect(plan, *, skip_stale=False):
+        def launch_side_effect(plan: Any, *, skip_stale: bool = False) -> Any:
             if not skip_stale:
                 return _stale_cm()
             return _ok_cm(bottle_mock)
@@ -138,14 +134,14 @@ class TestLaunchBottleStaleHandling(unittest.TestCase):
         self.assertFalse(calls[0].kwargs.get("skip_stale", False))
         self.assertTrue(calls[1].kwargs.get("skip_stale", False))
 
-    def test_interactive_yes_uppercase_also_accepted(self):
+    def test_interactive_yes_uppercase_also_accepted(self) -> None:
         """'Y' or 'YES' should also be accepted as confirmation."""
         import bot_bottle.cli.start as start_mod
 
         bottle_mock = MagicMock()
         bottle_mock.name = "dev-abc"
 
-        def launch_side_effect(plan, *, skip_stale=False):
+        def launch_side_effect(plan: Any, *, skip_stale: bool = False) -> Any:
             if not skip_stale:
                 return _stale_cm()
             return _ok_cm(bottle_mock)

tests/unit/test_image_cache.py

@@ -11,10 +11,6 @@ from unittest.mock import patch
 from bot_bottle.image_cache import StaleImageError, check_stale, check_stale_path
 
 
-def _utc(**kwargs) -> datetime:
-    return datetime.now(tz=timezone.utc) - timedelta(**kwargs)
-
-
 class TestCheckStale(unittest.TestCase):
     def _run(self, threshold: int, age_days: float) -> None:
         created = datetime.now(tz=timezone.utc) - timedelta(days=age_days)
@@ -53,7 +49,7 @@ class TestCheckStale(unittest.TestCase):
         # that would be interpreted as local time should still work.
         # We can't control the local tz in a unit test, so just ensure
         # no exception is thrown for a very recent naive datetime.
-        naive_now = datetime.utcnow()
+        naive_now = datetime(2099, 1, 1)  # far future, always "fresh"
         with patch("bot_bottle.image_cache.ConfigStore") as cs:
             cs.return_value.cached_image_stale_warning_days.return_value = 1
             # Should not raise — the image is brand new.

tests/unit/test_macos_container_launch.py

@@ -2,6 +2,7 @@
 
 from __future__ import annotations
 
+import dataclasses
 import unittest
 import tempfile
 from pathlib import Path
@@ -15,6 +16,7 @@ from bot_bottle.backend.macos_container import launch
 from bot_bottle.backend.macos_container.bottle_plan import MacosContainerBottlePlan
 from bot_bottle.egress import EgressPlan
 from bot_bottle.git_gate import GitGatePlan
+from bot_bottle.log import Die
 from bot_bottle.manifest import ManifestIndex
 
 _MANIFEST = ManifestIndex.from_json_obj({
@@ -373,17 +375,16 @@ class TestMacosContainerLaunchCachedImages(unittest.TestCase):
     def tearDown(self):
         self._tmp.cleanup()
 
-    def test_cached_mode_dies_when_agent_image_missing(self):
-        plan = _build_plan(self.stage_dir)
-        from bot_bottle.backend import BottleSpec
-        import dataclasses
-        plan = dataclasses.replace(
-            plan,
+    def _cached_plan(self) -> MacosContainerBottlePlan:
+        return dataclasses.replace(
+            _build_plan(self.stage_dir),
             spec=cast(BottleSpec, SimpleNamespace(image_policy="cached")),
         )
-        from bot_bottle.log import Die
 
-        def image_exists(ref: str) -> bool:
+    def test_cached_mode_dies_when_agent_image_missing(self) -> None:
+        plan = self._cached_plan()
+
+        def image_exists(ref: str) -> bool:  # pylint: disable=unused-argument
             return False  # Nothing cached.
 
         with patch.object(
@@ -391,43 +392,29 @@ class TestMacosContainerLaunchCachedImages(unittest.TestCase):
         ), patch.object(
             launch.container_mod, "image_exists", side_effect=image_exists,
         ), patch.object(
-            launch, "die", side_effect=Die("no agent image"),
+            launch, "die", side_effect=Die(),
         ):
             with self.assertRaises(Die):
                 launch._build_images(plan)
 
-    def test_cached_mode_dies_when_sidecar_image_missing(self):
-        plan = _build_plan(self.stage_dir)
-        from bot_bottle.backend import BottleSpec
-        import dataclasses
-        plan = dataclasses.replace(
-            plan,
-            spec=cast(BottleSpec, SimpleNamespace(image_policy="cached")),
-        )
-        from bot_bottle.log import Die
+    def test_cached_mode_dies_when_sidecar_image_missing(self) -> None:
+        plan = self._cached_plan()
 
         def image_exists(ref: str) -> bool:
-            # Agent image is present; sidecar is missing.
-            return ref == plan.image
+            return ref == plan.image  # Agent present; sidecar missing.
 
         with patch.object(
             launch, "read_committed_image", return_value="",
         ), patch.object(
             launch.container_mod, "image_exists", side_effect=image_exists,
         ), patch.object(
-            launch, "die", side_effect=Die("no sidecar image"),
+            launch, "die", side_effect=Die(),
         ):
             with self.assertRaises(Die):
                 launch._build_images(plan)
 
-    def test_cached_mode_both_present_returns_unchanged_plan(self):
-        plan = _build_plan(self.stage_dir)
-        from bot_bottle.backend import BottleSpec
-        import dataclasses
-        plan = dataclasses.replace(
-            plan,
-            spec=cast(BottleSpec, SimpleNamespace(image_policy="cached")),
-        )
+    def test_cached_mode_both_present_returns_unchanged_plan(self) -> None:
+        plan = self._cached_plan()
         with patch.object(
             launch, "read_committed_image", return_value="",
         ), patch.object(
@@ -440,14 +427,8 @@ class TestMacosContainerLaunchCachedImages(unittest.TestCase):
         build.assert_not_called()
         self.assertEqual(plan.image, result.image)
 
-    def test_committed_image_plus_cached_skips_sidecar_build(self):
-        plan = _build_plan(self.stage_dir)
-        from bot_bottle.backend import BottleSpec
-        import dataclasses
-        plan = dataclasses.replace(
-            plan,
-            spec=cast(BottleSpec, SimpleNamespace(image_policy="cached")),
-        )
+    def test_committed_image_plus_cached_skips_sidecar_build(self) -> None:
+        plan = self._cached_plan()
         with patch.object(
             launch, "read_committed_image",
             return_value="bot-bottle-committed-dev-abc:latest",

tests/unit/test_stale_checks.py

@@ -6,7 +6,6 @@ calls are mocked at the module boundary."""
 
 from __future__ import annotations
 
-import contextlib
 import tempfile
 import unittest
 from pathlib import Path
@@ -14,7 +13,13 @@ from types import SimpleNamespace
 from typing import Any, cast
 from unittest.mock import MagicMock, patch
 
-from bot_bottle.image_cache import StaleImageError
+
+def _bottle_cm(bottle: Any) -> MagicMock:
+    """Return a mock context manager that yields `bottle`."""
+    cm = MagicMock()
+    cm.__enter__ = MagicMock(return_value=bottle)
+    cm.__exit__ = MagicMock(return_value=False)
+    return cm
 
 
 # ---------------------------------------------------------------------------
@@ -25,78 +30,44 @@ class TestBottleBackendLaunchTemplate(unittest.TestCase):
     """Verify the concrete launch() method on BottleBackend calls
     _image_stale_checks unless skip_stale=True, then delegates to _launch_impl."""
 
-    def _make_backend(self):
-        from bot_bottle.backend import BottleBackend
+    def _make_backend(self) -> Any:
+        from bot_bottle.backend.docker.backend import DockerBottleBackend
+        return DockerBottleBackend()
 
-        class _FakeBottle:
-            name = "fake"
-
-        @contextlib.contextmanager
-        def _fake_impl(plan):
-            yield _FakeBottle()
-
-        class _FakeBackend(BottleBackend):
-            name = "fake"
-
-            @classmethod
-            def is_available(cls): return True
-
-            def _preflight(self): pass
-            def _build_guest_env(self, env): return {}
-            def _resolve_plan(self, spec, **kw): return cast(Any, SimpleNamespace())
-
-            @contextlib.contextmanager
-            def _launch_impl(self, plan):
-                yield _FakeBottle()
-
-            def prepare_cleanup(self): return cast(Any, None)
-            def cleanup(self, plan): pass
-            def enumerate_active(self): return []
-
-        return _FakeBackend()
-
-    def test_stale_checks_called_by_default(self):
+    def test_stale_checks_called_by_default(self) -> None:
         backend = self._make_backend()
-        called = []
-        backend._image_stale_checks = lambda plan: called.append(True)  # type: ignore[method-assign]
         plan = cast(Any, SimpleNamespace())
-        with backend.launch(plan):
-            pass
-        self.assertEqual([True], called)
+        bottle = MagicMock()
+        with patch.object(
+            backend, "_image_stale_checks",
+        ) as stale_mock, patch.object(
+            backend, "_launch_impl",
+            return_value=_bottle_cm(bottle),
+        ):
+            with backend.launch(plan):
+                pass
+        stale_mock.assert_called_once_with(plan)
 
-    def test_skip_stale_bypasses_stale_checks(self):
+    def test_skip_stale_bypasses_stale_checks(self) -> None:
         backend = self._make_backend()
-        backend._image_stale_checks = lambda plan: (_ for _ in ()).throw(  # type: ignore[method-assign]
-            AssertionError("should not be called")
-        )
         plan = cast(Any, SimpleNamespace())
-        with backend.launch(plan, skip_stale=True):
-            pass
+        bottle = MagicMock()
+        with patch.object(
+            backend, "_image_stale_checks",
+        ) as stale_mock, patch.object(
+            backend, "_launch_impl",
+            return_value=_bottle_cm(bottle),
+        ):
+            with backend.launch(plan, skip_stale=True):
+                pass
+        stale_mock.assert_not_called()
 
-    def test_noop_default_image_stale_checks(self):
+    def test_noop_default_image_stale_checks(self) -> None:
+        from bot_bottle.backend.docker.backend import DockerBottleBackend
         from bot_bottle.backend import BottleBackend
-
-        class _MinimalBackend(BottleBackend):
-            name = "minimal"
-
-            @classmethod
-            def is_available(cls): return True
-
-            def _preflight(self): pass
-            def _build_guest_env(self, env): return {}
-            def _resolve_plan(self, spec, **kw): return cast(Any, SimpleNamespace())
-
-            @contextlib.contextmanager
-            def _launch_impl(self, plan):
-                yield cast(Any, SimpleNamespace(name="x"))
-
-            def prepare_cleanup(self): return cast(Any, None)
-            def cleanup(self, plan): pass
-            def enumerate_active(self): return []
-
-        backend = _MinimalBackend()
-        # The default _image_stale_checks must not raise — it's a no-op.
-        backend._image_stale_checks(cast(Any, SimpleNamespace()))
+        backend = DockerBottleBackend()
+        # Call the base-class _image_stale_checks directly to verify it's a no-op.
+        BottleBackend._image_stale_checks(backend, cast(Any, SimpleNamespace()))  # type: ignore[arg-type]
 
 
 # ---------------------------------------------------------------------------
@@ -104,8 +75,6 @@ class TestBottleBackendLaunchTemplate(unittest.TestCase):
 # ---------------------------------------------------------------------------
 
 class TestDockerStaleChecks(unittest.TestCase):
-    from bot_bottle.backend.docker import launch as _docker_launch_mod
-
     def _plan(self, policy: str = "cached", slug: str = "dev-abc") -> Any:
         spec = SimpleNamespace(image_policy=policy)
         provision = SimpleNamespace(image="bot-bottle-agent:latest")
@@ -116,7 +85,7 @@ class TestDockerStaleChecks(unittest.TestCase):
             agent_provision=provision,
         ))
 
-    def test_fresh_policy_is_noop(self):
+    def test_fresh_policy_is_noop(self) -> None:
         from bot_bottle.backend.docker import launch as mod
         with patch.object(mod, "read_committed_image") as rci, \
              patch.object(mod, "check_stale") as cs:
@@ -124,7 +93,7 @@ class TestDockerStaleChecks(unittest.TestCase):
         rci.assert_not_called()
         cs.assert_not_called()
 
-    def test_committed_image_present_checks_only_committed(self):
+    def test_committed_image_present_checks_only_committed(self) -> None:
         from bot_bottle.backend.docker import launch as mod
         from datetime import datetime, timezone
         ts = datetime(2025, 1, 1, tzinfo=timezone.utc)
@@ -136,7 +105,7 @@ class TestDockerStaleChecks(unittest.TestCase):
         cs.assert_called_once()
         self.assertIn("committed:latest", cs.call_args.args[0])
 
-    def test_no_committed_image_checks_agent_and_sidecar(self):
+    def test_no_committed_image_checks_agent_and_sidecar(self) -> None:
         from bot_bottle.backend.docker import launch as mod
         from datetime import datetime, timezone
         ts = datetime(2025, 1, 1, tzinfo=timezone.utc)
@@ -148,7 +117,7 @@ class TestDockerStaleChecks(unittest.TestCase):
         # Should have been called for both agent and sidecar images.
         self.assertEqual(2, cs.call_count)
 
-    def test_image_not_present_skips_check(self):
+    def test_image_not_present_skips_check(self) -> None:
         from bot_bottle.backend.docker import launch as mod
         with patch.object(mod, "read_committed_image", return_value=""), \
              patch.object(mod.docker_mod, "image_exists", return_value=False), \
@@ -156,18 +125,7 @@ class TestDockerStaleChecks(unittest.TestCase):
             mod.stale_checks(self._plan())
         cs.assert_not_called()
 
-    def test_backend_image_stale_checks_delegates(self):
-        from bot_bottle.backend.docker.backend import DockerBottleBackend
-        from bot_bottle.backend.docker import launch as mod
-        backend = DockerBottleBackend()
-        plan = self._plan()
-        with patch.object(mod, "stale_checks") as sc:
-            backend._image_stale_checks(plan)
-        sc.assert_called_once_with(plan)
-
-    def test_no_committed_image_only_sidecar_missing_skips_check(self):
-        # When no committed image, stale_checks checks each image that EXISTS.
-        # If an image isn't present, check_stale is not called for it.
+    def test_only_sidecar_missing_checks_only_agent(self) -> None:
         from bot_bottle.backend.docker import launch as mod
         from datetime import datetime, timezone
         ts = datetime(2025, 1, 1, tzinfo=timezone.utc)
@@ -181,10 +139,18 @@ class TestDockerStaleChecks(unittest.TestCase):
              patch.object(mod.docker_mod, "image_created_at", return_value=ts), \
              patch.object(mod, "check_stale") as cs:
             mod.stale_checks(plan)
-        # Only agent was checked (sidecar not present → skipped).
         self.assertEqual(1, cs.call_count)
         self.assertIn(plan.image, cs.call_args.args[0])
 
+    def test_backend_image_stale_checks_delegates(self) -> None:
+        from bot_bottle.backend.docker.backend import DockerBottleBackend
+        from bot_bottle.backend.docker import launch as mod
+        backend = DockerBottleBackend()
+        plan = self._plan()
+        with patch.object(mod, "stale_checks") as sc:
+            backend._image_stale_checks(plan)  # type: ignore[arg-type]
+        sc.assert_called_once_with(plan)
+
 
 # ---------------------------------------------------------------------------
 # smolmachines backend stale_checks
@@ -198,7 +164,7 @@ class TestSmolmachinesStaleChecks(unittest.TestCase):
             agent_image="bot-bottle-claude:latest",
         ))
 
-    def test_fresh_policy_is_noop(self):
+    def test_fresh_policy_is_noop(self) -> None:
         from bot_bottle.backend.smolmachines import launch as mod
         with patch.object(mod, "read_committed_image") as rci, \
              patch.object(mod, "check_stale_path") as csp:
@@ -206,7 +172,7 @@ class TestSmolmachinesStaleChecks(unittest.TestCase):
         rci.assert_not_called()
         csp.assert_not_called()
 
-    def test_committed_artifact_found_checks_it(self):
+    def test_committed_artifact_found_checks_it(self) -> None:
         from bot_bottle.backend.smolmachines import launch as mod
         with tempfile.NamedTemporaryFile(suffix=".smolmachine") as f:
             committed_path = f.name
@@ -217,7 +183,7 @@ class TestSmolmachinesStaleChecks(unittest.TestCase):
         csp.assert_called_once()
         self.assertIn("agent smolmachine", csp.call_args.args[0])
 
-    def test_no_committed_agent_artifact_in_cache_is_checked(self):
+    def test_no_committed_agent_artifact_in_cache_is_checked(self) -> None:
         from bot_bottle.backend.smolmachines import launch as mod
         digest = "abcdef0123456789"
         with tempfile.TemporaryDirectory() as tmp:
@@ -226,28 +192,31 @@ class TestSmolmachinesStaleChecks(unittest.TestCase):
             with patch.object(mod, "_SMOLMACHINE_CACHE_DIR", Path(tmp)), \
                  patch.object(mod, "read_committed_image", return_value=""), \
                  patch.object(mod.docker_mod, "image_exists", return_value=True), \
-                 patch.object(mod.docker_mod, "image_id",
-                              return_value=f"sha256:{digest}ffffffffffffffff"), \
+                 patch.object(
+                     mod.docker_mod, "image_id",
+                     return_value=f"sha256:{digest}ffffffffffffffff",
+                 ), \
                  patch.object(mod, "check_stale_path") as csp:
                 mod.stale_checks(self._plan())
         # At least the agent artifact check ran.
         self.assertGreaterEqual(csp.call_count, 1)
 
-    def test_sidecar_artifact_in_cache_is_checked(self):
+    def test_sidecar_artifact_in_cache_is_checked(self) -> None:
         from bot_bottle.backend.smolmachines import launch as mod
-        digest = "1234567890abcdef"
         sidecar_digest = "fedcba9876543210"
         with tempfile.TemporaryDirectory() as tmp:
-            sidecar_artifact = Path(tmp) / f"{sidecar_digest}.smolmachine.smolmachine"
+            sidecar_artifact = (
+                Path(tmp) / f"{sidecar_digest}.smolmachine.smolmachine"
+            )
             sidecar_artifact.write_text("")
 
-            def image_exists(ref: str) -> bool:
+            def image_exists(ref: str) -> bool:  # pylint: disable=unused-argument
                 return True
 
             def image_id(ref: str) -> str:
-                if "sidecar" in ref or ref == mod._bundle.SIDECAR_BUNDLE_IMAGE:
+                if ref == mod._bundle.SIDECAR_BUNDLE_IMAGE:  # type: ignore[attr-defined]
                     return f"sha256:{sidecar_digest}ffffffff"
-                return f"sha256:{digest}ffffffff"
+                return "sha256:0000000000000000ffffffff"
 
             with patch.object(mod, "_SMOLMACHINE_CACHE_DIR", Path(tmp)), \
                  patch.object(mod, "read_committed_image", return_value=""), \
@@ -255,17 +224,16 @@ class TestSmolmachinesStaleChecks(unittest.TestCase):
                  patch.object(mod.docker_mod, "image_id", side_effect=image_id), \
                  patch.object(mod, "check_stale_path") as csp:
                 mod.stale_checks(self._plan())
-        # sidecar artifact is present, so check_stale_path should fire for it.
         sidecar_calls = [c for c in csp.call_args_list if "sidecar" in c.args[0]]
-        self.assertTrue(len(sidecar_calls) >= 1)
+        self.assertGreaterEqual(len(sidecar_calls), 1)
 
-    def test_backend_image_stale_checks_delegates(self):
+    def test_backend_image_stale_checks_delegates(self) -> None:
         from bot_bottle.backend.smolmachines.backend import SmolmachinesBottleBackend
         from bot_bottle.backend.smolmachines import launch as mod
         backend = SmolmachinesBottleBackend()
         plan = self._plan()
         with patch.object(mod, "stale_checks") as sc:
-            backend._image_stale_checks(plan)
+            backend._image_stale_checks(plan)  # type: ignore[arg-type]
         sc.assert_called_once_with(plan)
 
 
@@ -281,7 +249,7 @@ class TestMacosContainerStaleChecks(unittest.TestCase):
             image="bot-bottle-agent:latest",
         ))
 
-    def test_fresh_policy_is_noop(self):
+    def test_fresh_policy_is_noop(self) -> None:
         from bot_bottle.backend.macos_container import launch as mod
         with patch.object(mod, "read_committed_image") as rci, \
              patch.object(mod, "check_stale") as cs:
@@ -289,7 +257,7 @@ class TestMacosContainerStaleChecks(unittest.TestCase):
         rci.assert_not_called()
         cs.assert_not_called()
 
-    def test_committed_image_present_checks_only_committed(self):
+    def test_committed_image_present_checks_only_committed(self) -> None:
         from bot_bottle.backend.macos_container import launch as mod
         from datetime import datetime, timezone
         ts = datetime(2025, 1, 1, tzinfo=timezone.utc)
@@ -301,7 +269,7 @@ class TestMacosContainerStaleChecks(unittest.TestCase):
         cs.assert_called_once()
         self.assertIn("committed:latest", cs.call_args.args[0])
 
-    def test_no_committed_image_checks_agent_and_sidecar(self):
+    def test_no_committed_image_checks_agent_and_sidecar(self) -> None:
         from bot_bottle.backend.macos_container import launch as mod
         from datetime import datetime, timezone
         ts = datetime(2025, 1, 1, tzinfo=timezone.utc)
@@ -312,7 +280,7 @@ class TestMacosContainerStaleChecks(unittest.TestCase):
             mod.stale_checks(self._plan())
         self.assertEqual(2, cs.call_count)
 
-    def test_image_not_present_skips_check(self):
+    def test_image_not_present_skips_check(self) -> None:
         from bot_bottle.backend.macos_container import launch as mod
         with patch.object(mod, "read_committed_image", return_value=""), \
              patch.object(mod.container_mod, "image_exists", return_value=False), \
@@ -320,13 +288,13 @@ class TestMacosContainerStaleChecks(unittest.TestCase):
             mod.stale_checks(self._plan())
         cs.assert_not_called()
 
-    def test_backend_image_stale_checks_delegates(self):
+    def test_backend_image_stale_checks_delegates(self) -> None:
         from bot_bottle.backend.macos_container.backend import MacosContainerBottleBackend
         from bot_bottle.backend.macos_container import launch as mod
         backend = MacosContainerBottleBackend()
         plan = self._plan()
         with patch.object(mod, "stale_checks") as sc:
-            backend._image_stale_checks(plan)
+            backend._image_stale_checks(plan)  # type: ignore[arg-type]
         sc.assert_called_once_with(plan)