CAN fingerprint: test fingerprint response (#29462)

* test finger

* split up
old-commit-hash: 19767da668

selfdrive/car/tests/test_can_fingerprint.py

@@ -10,17 +10,20 @@ from selfdrive.car.fingerprints import _FINGERPRINTS as FINGERPRINTS
 class TestCanFingerprint(unittest.TestCase):
   @parameterized.expand([(c, f) for c, f in FINGERPRINTS.items()])
   def test_can_fingerprint(self, car_model, fingerprints):
-    # Tests online fingerprinting function on offline fingerprints
+    """Tests online fingerprinting function on offline fingerprints"""
+
     for fingerprint in fingerprints:  # can have multiple fingerprints for each platform
       can = messaging.new_message('can', 1)
-      can.can = [log.CanData(address=address, dat=b'\x00' * length)
+      can.can = [log.CanData(address=address, dat=b'\x00' * length, src=src)
-                 for address, length in fingerprint.items()]
+                 for address, length in fingerprint.items() for src in (0, 1)]
 
       fingerprint_iter = iter([can])
       empty_can = messaging.new_message('can', 0)
       car_fingerprint, finger = can_fingerprint(lambda: next(fingerprint_iter, empty_can))  # noqa: B023
 
       self.assertEqual(car_fingerprint, car_model)
+      self.assertEqual(finger[0], fingerprint)
+      self.assertEqual(finger[1], fingerprint)
 
 
 if __name__ == "__main__":