diff --git a/selfdrive/car/tests/test_car_interfaces.py b/selfdrive/car/tests/test_car_interfaces.py
index 4fbd167dce..a94697ef43 100755
--- a/selfdrive/car/tests/test_car_interfaces.py
+++ b/selfdrive/car/tests/test_car_interfaces.py
@@ -15,6 +15,9 @@ from selfdrive.test.fuzzy_generation import FuzzyGenerator
 Ecu = car.CarParams.Ecu
 
 
+# def get_fuzzy_car_params_
+
+
 class TestCarInterfaces(unittest.TestCase):
 
   @parameterized.expand([(car,) for car in sorted(all_known_cars())])
@@ -42,6 +45,7 @@ class TestCarInterfaces(unittest.TestCase):
 
     params = data.draw(params_strategy)
     car_fw = [car.CarParams.CarFw(**fw) for fw in params['car_fw']]
+    print(car_fw)
 
     car_params = CarInterface.get_params(car_name, params['fingerprints'], car_fw,
                                          experimental_long=params['experimental_long'], docs=False)
diff --git a/selfdrive/test/fuzzy_generation.py b/selfdrive/test/fuzzy_generation.py
index bde9b6efcf..052b145f59 100644
--- a/selfdrive/test/fuzzy_generation.py
+++ b/selfdrive/test/fuzzy_generation.py
@@ -64,7 +64,7 @@ class FuzzyGenerator:
 
   def generate_struct(self, schema, event=None):
     full_fill = list(schema.non_union_fields) if schema.non_union_fields else []
-    single_fill = [event] if event else [self.draw(st.sampled_from(schema.union_fields))] if schema.union_fields else []
+    single_fill = [event] if event else [st.sampled_from(schema.union_fields)] if schema.union_fields else []
     return st.fixed_dictionaries(dict((field, self.generate_field(schema.fields[field])) for field in full_fill + single_fill))
 
   @classmethod