test_manager: ensure test independence (#31364)

* ensure independent

* still run 10- times

* need index

---------

Co-authored-by: Comma Device <device@comma.ai>

selfdrive/manager/test/test_manager.py

@@ -5,6 +5,8 @@ import signal
 import time
 import unittest
 
+from parameterized import parameterized
+
 from cereal import car
 from openpilot.common.params import Params
 import openpilot.selfdrive.manager.manager as manager
@@ -38,8 +40,8 @@ class TestManager(unittest.TestCase):
     # TODO: ensure there are blacklisted procs until we have a dedicated test
     self.assertTrue(len(BLACKLIST_PROCS), "No blacklisted procs to test not_run")
 
-  def test_startup_time(self):
-    for _ in range(10):
+  @parameterized.expand(range(10))
+  def test_startup_time(self, index):
     start = time.monotonic()
     os.environ['PREPAREONLY'] = '1'
     manager.main()