Move icon constants to entity attributes (#90518)

* Move icon constants to attribute

* Adjust test

homeassistant/components/simulated/sensor.py

@@ -34,8 +34,6 @@ DEFAULT_SEED = 999
 DEFAULT_UNIT = "value"
 DEFAULT_RELATIVE_TO_EPOCH = True
 
-ICON = "mdi:chart-line"
-
 PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend(
     {
         vol.Optional(CONF_AMP, default=DEFAULT_AMP): vol.Coerce(float),
@@ -79,6 +77,8 @@ def setup_platform(
 class SimulatedSensor(SensorEntity):
     """Class for simulated sensor."""
 
+    _attr_icon = "mdi:chart-line"
+
     def __init__(
         self, name, unit, amp, mean, period, phase, fwhm, seed, relative_to_epoch
     ):
@@ -135,11 +135,6 @@ class SimulatedSensor(SensorEntity):
         """Return the state of the sensor."""
         return self._state
 
-    @property
-    def icon(self):
-        """Icon to use in the frontend, if any."""
-        return ICON
-
     @property
     def native_unit_of_measurement(self):
         """Return the unit this state is expressed in."""