Add preheating HVAC action to climate (#94677)

* Add preheating HVAC action to climate

* Fix MQTT tests

homeassistant/components/climate/const.py

@@ -96,6 +96,7 @@ class HVACAction(StrEnum):
     HEATING = "heating"
     IDLE = "idle"
     OFF = "off"
+    PREHEATING = "preheating"
 
 
 # These CURRENT_HVAC_* constants are deprecated as of Home Assistant 2022.5.

homeassistant/components/climate/strings.json

@@ -54,6 +54,7 @@
           "name": "Current action",
           "state": {
             "off": "Off",
+            "preheating": "Preheating",
             "heating": "Heating",
             "cooling": "Cooling",
             "drying": "Drying",

tests/components/mqtt/test_climate.py

@@ -966,7 +966,7 @@ async def test_handle_action_received(
     hvac_action = state.attributes.get(ATTR_HVAC_ACTION)
     assert hvac_action is None
     # Redefine actions according to https://developers.home-assistant.io/docs/core/entity/climate/#hvac-action
-    actions = ["off", "heating", "cooling", "drying", "idle", "fan"]
+    actions = ["off", "preheating", "heating", "cooling", "drying", "idle", "fan"]
     assert all(elem in actions for elem in HVACAction)
     for action in actions:
         async_fire_mqtt_message(hass, "action", action)