Add humidifier support to prometheus (#37112)

* Add humidifier support to promethease

* add humidifier dependency

* handle dependencies

* wrong place

* applied suggestions from code review

* fix typo

* Revert "wrong place"

This reverts commit 58e509d767.

* Revert "handle dependencies"

This reverts commit 74bd523e08.

* Revert "add humidifier dependency"

This reverts commit 8840b378e5.

tests/components/prometheus/test_init.py

@@ -4,7 +4,7 @@ from dataclasses import dataclass
 import pytest
 
 from homeassistant import setup
-from homeassistant.components import climate, sensor
+from homeassistant.components import climate, humidifier, sensor
 from homeassistant.components.demo.sensor import DemoSensor
 import homeassistant.components.prometheus as prometheus
 from homeassistant.const import (
@@ -44,6 +44,10 @@ async def prometheus_client(loop, hass, hass_client):
     )
     await hass.async_block_till_done()
 
+    await setup.async_setup_component(
+        hass, humidifier.DOMAIN, {"humidifier": [{"platform": "demo"}]}
+    )
+
     sensor1 = DemoSensor(
         None, "Television Energy", 74, None, ENERGY_KILO_WATT_HOUR, None
     )
@@ -120,6 +124,31 @@ async def test_view(prometheus_client):  # pylint: disable=redefined-outer-name
         'friendly_name="HeatPump"} 25.0' in body
     )
 
+    assert (
+        'humidifier_target_humidity_percent{domain="humidifier",'
+        'entity="humidifier.humidifier",'
+        'friendly_name="Humidifier"} 68.0' in body
+    )
+
+    assert (
+        'humidifier_state{domain="humidifier",'
+        'entity="humidifier.dehumidifier",'
+        'friendly_name="Dehumidifier"} 1.0' in body
+    )
+
+    assert (
+        'humidifier_mode{domain="humidifier",'
+        'entity="humidifier.hygrostat",'
+        'friendly_name="Hygrostat",'
+        'mode="home"} 1.0' in body
+    )
+    assert (
+        'humidifier_mode{domain="humidifier",'
+        'entity="humidifier.hygrostat",'
+        'friendly_name="Hygrostat",'
+        'mode="eco"} 0.0' in body
+    )
+
     assert (
         'humidity_percent{domain="sensor",'
         'entity="sensor.outside_humidity",'