Add deactivate_heater G-Code

api/src/opentrons/hardware_control/emulation/heater_shaker.py

@@ -134,7 +134,8 @@ def _get_labware_latch_state(self, command: Command) -> str:
         return f"M241 STATUS:{self._latch_status.value.upper()}"
 
     def _deactivate_heater(self, command: Command) -> str:
-        pass
+        self._temperature.set_target(None)
+        return f"M106"
 
     @staticmethod
     def get_terminator() -> bytes:

api/src/opentrons/hardware_control/emulation/simulations.py

@@ -40,7 +40,7 @@ def deactivate(self, temperature: float) -> None:
         self._target = None
         self._current = temperature
 
-    def set_target(self, target: float) -> None:
+    def set_target(self, target: Optional[float]) -> None:
         self._target = target
 
     @property

api/tests/opentrons/hardware_control/integration/test_heatershaker.py

@@ -80,11 +80,25 @@ async def test_deactivate_shaker(heatershaker: HeaterShaker) -> None:
     assert heatershaker.target_speed is None
     assert heatershaker.speed == 0
 
+async def test_deactivate_heater(heatershaker: HeaterShaker) -> None:
+    await heatershaker.wait_next_poll()
+    await heatershaker.start_set_temperature(50.0)
+    await heatershaker.await_temperature(50.0)
+    assert heatershaker.target_temperature == 50.0
+    assert 49.3 <= heatershaker.temperature <= 50.7
+
+    await heatershaker.deactivate_heater()
+    assert heatershaker.target_temperature is None
+
+    assert 49.3 <= heatershaker.temperature <= 50.7  # Temp should not change
+    await heatershaker.wait_next_poll()
+    await heatershaker.wait_next_poll()
+    await heatershaker.wait_next_poll()
+    assert 49.3 <= heatershaker.temperature <= 50.7  # Temp should not change
+
 
 async def test_temp(heatershaker: HeaterShaker) -> None:
     """Test setting temp"""
-    await heatershaker.wait_next_poll()
-    await heatershaker.start_set_temperature(50.0)
 
     # Have to wait for next poll because target temp will not update until then
     await heatershaker.wait_next_poll()