Tests: power_monitoring disable nonblocking writes (#29994)

* better error logging

* fix power monitoring test

* revert that

* properly patch it

selfdrive/test/helpers.py

@@ -69,3 +69,7 @@ def with_processes(processes, init_time=0, ignore_stopped=None):
 
     return wrap
   return wrapper
+
+
+def noop(*args, **kwargs):
+  pass

selfdrive/thermald/tests/test_power_monitoring.py

@@ -3,6 +3,7 @@ import unittest
 from unittest.mock import patch
 
 from openpilot.common.params import Params
+from openpilot.selfdrive.test.helpers import noop
 from openpilot.selfdrive.thermald.power_monitoring import PowerMonitoring, CAR_BATTERY_CAPACITY_uWh, \
                                                 CAR_CHARGING_RATE_W, VBATT_PAUSE_CHARGING, DELAY_SHUTDOWN_TIME_S
 
@@ -25,6 +26,7 @@ def pm_patch(name, value, constant=False):
 
 
 @patch("time.monotonic", new=mock_time_monotonic)
+@patch("openpilot.selfdrive.thermald.power_monitoring.put_nonblocking", new=noop) # TODO: Remove this once nonblocking params are safer
 class TestPowerMonitoring(unittest.TestCase):
   def setUp(self):
     self.params = Params()