test_models: more typing (#29420)

* not type checked, but we set this in test_car_model

* type this

selfdrive/car/tests/routes.py

@@ -33,7 +33,7 @@ non_tested_cars = [
 
 class CarTestRoute(NamedTuple):
   route: str
-  car_model: str
+  car_model: Optional[str]
   segment: Optional[int] = None
 
 

selfdrive/car/tests/test_models.py

@@ -66,9 +66,9 @@ SKIP_ENV_VAR = "SKIP_LONG_TESTS"
 
 
 class TestCarModelBase(unittest.TestCase):
-  car_model = None
-  test_route = None
-  ci = True
+  car_model: Optional[str] = None
+  test_route: Optional[CarTestRoute] = None
+  ci: bool = True
 
   @unittest.skipIf(SKIP_ENV_VAR in os.environ, f"Long running test skipped. Unset {SKIP_ENV_VAR} to run")
   @classmethod