diff --git a/src/primaite/simulator/sim_container.py b/src/primaite/simulator/sim_container.py
index db8a718c..896861e6 100644
--- a/src/primaite/simulator/sim_container.py
+++ b/src/primaite/simulator/sim_container.py
@@ -60,4 +60,3 @@ class Simulation(SimComponent):
         """Apply a timestep to the simulation."""
         super().apply_timestep(timestep)
         self.network.apply_timestep(timestep)
-        # self.domain.apply_timestep(timestep)
diff --git a/tests/unit_tests/_primaite/_simulator/_system/_services/test_service_actions.py b/tests/unit_tests/_primaite/_simulator/_system/_services/test_service_actions.py
index 6b2ee0a7..714644e4 100644
--- a/tests/unit_tests/_primaite/_simulator/_system/_services/test_service_actions.py
+++ b/tests/unit_tests/_primaite/_simulator/_system/_services/test_service_actions.py
@@ -78,3 +78,16 @@ def test_service_enable(service):
 
     service.apply_request(["enable"])
     assert service.operating_state == ServiceOperatingState.STOPPED
+
+
+def test_service_patch(service):
+    """Test that a service can be patched and that it takes two timesteps to complete."""
+    service.start()
+    assert service.health_state_actual == SoftwareHealthState.GOOD
+
+    service.apply_request(["patch"])
+    assert service.health_state_actual == SoftwareHealthState.PATCHING
+    service.apply_timestep(1)
+    assert service.health_state_actual == SoftwareHealthState.PATCHING
+    service.apply_timestep(2)
+    assert service.health_state_actual == SoftwareHealthState.GOOD