Narrow test fixture types before mutation

openpilot/starpilot/ui/tests/test_jeep_brake_hold_preference.py

@@ -40,7 +40,9 @@ class TestJeepBrakeHoldPreference(unittest.TestCase):
       row = next(
         row for row in owner.snapshot('vehicle', parked=True, system_long=False, lateral_context=True, metric=False).rows if row.key == 'JeepBrakeHold'
       )
-      request = replace(row_change(row), confirmation=True)
+      change = row_change(row)
+      assert change is not None
+      request = replace(change, confirmation=True)
       for group in groups:
         groups[group] = False
         self.assertFalse(owner.apply(request))

openpilot/system/manager/test/test_process_recovery.py

@@ -128,6 +128,7 @@ class TestProcessRecovery(unittest.TestCase):
     self.step(p)
     old = p.proc
     self.assertIsNotNone(old)
+    assert isinstance(old, Child)
     old.exitcode = 1
     self.step(p)
     self.assertIs(p.proc, old)
@@ -135,6 +136,7 @@ class TestProcessRecovery(unittest.TestCase):
     self.step(p)
     self.assertIsNot(p.proc, old)
     self.assertTrue(old.joined)
+    assert isinstance(p.proc, Child)
     p.proc.exitcode = 1
     self.step(p)
     self.step(p, started=False)