diff --git a/smarts/core/agent_manager.py b/smarts/core/agent_manager.py
index 167fc45f9c..8cd07b3116 100644
--- a/smarts/core/agent_manager.py
+++ b/smarts/core/agent_manager.py
@@ -200,7 +200,6 @@ def observe(
         }
 
         sim_frame = sim.cached_frame
-        print(f"{self.active_agents=}-{sim_frame.agent_ids=}")
         for agent_id in self.active_agents:
             # An agent may be pointing to its own vehicle or observing a social vehicle
             vehicle_ids = self._vehicle_index.vehicle_ids_by_actor_id(
diff --git a/smarts/core/sensors.py b/smarts/core/sensors.py
index 47b87306d4..f8cc211796 100644
--- a/smarts/core/sensors.py
+++ b/smarts/core/sensors.py
@@ -365,7 +365,7 @@ def observe_parallel(
         )
         used_workers: List[SensorsWorker] = []
         with timeit(
-            f"parallizable observations with {len(agent_ids)=} and {len(workers)=}",
+            f"parallizable observations with {len(agent_ids)} and {len(workers)}",
             print,
         ):
             if len(workers) >= 1:
diff --git a/smarts/core/tests/test_parallel_sensors.py b/smarts/core/tests/test_parallel_sensors.py
index d2f6a2d48f..fc39a14153 100644
--- a/smarts/core/tests/test_parallel_sensors.py
+++ b/smarts/core/tests/test_parallel_sensors.py
@@ -30,7 +30,7 @@
 from smarts.core.plan import Mission
 from smarts.core.road_map import RoadMap
 from smarts.core.scenario import Scenario
-from smarts.core.sensors import Observation, Sensors, SensorState, SensorsWorker
+from smarts.core.sensors import Observation, Sensors, SensorState, SensorsWorker, WorkerKwargs
 from smarts.core.simulation_frame import SimulationFrame
 from smarts.core.simulation_local_constants import SimulationLocalConstants
 from smarts.core.smarts import SMARTS
@@ -152,24 +152,26 @@ def observe_with_processes(processes):
         serial_total > parallel_1_total
         or serial_total > parallel_2_total
         or serial_total > parallel_3_total
-    ), f"{serial_total=}, {parallel_1_total=}, {parallel_2_total=}, {parallel_3_total=} {parallel_4_total=}"
+    ), f"{serial_total}, {parallel_1_total}, {parallel_2_total}, {parallel_3_total} {parallel_4_total}"
 
 
 def test_sensor_worker(
-    simulation_frame: SimulationState,
+    sim: SMARTS,
 ):
-    return
+    del sim.cached_frame
+    simulation_frame: SimulationFrame = sim.cached_frame
     agent_ids = set(AGENT_IDS)
     worker = SensorsWorker()
-    worker.run()
-    worker.send_to_process(simulation_frame, agent_ids)
-    observations, dones = SensorsWorker.local(simulation_frame, agent_ids)
-    other_observations, other_dones = worker.result(block=True)
+    worker.run(sim_local_constants=sim.local_constants)
+    worker_args = WorkerKwargs(sim_frame=simulation_frame)
+    worker.send_to_process(worker_args=worker_args, agent_ids=agent_ids)
+    observations, dones = SensorsWorker.local(simulation_frame, sim.local_constants, agent_ids)
+    other_observations, other_dones = worker.result(block=True, timeout=5)
 
     assert isinstance(observations, dict)
     assert all(
         [isinstance(obs, Observation) for obs in observations.values()]
-    ), f"{observations=}"
+    ), f"{observations}"
     assert isinstance(dones, dict)
     assert all([isinstance(obs, bool) for obs in dones.values()])
     assert isinstance(other_observations, dict)