Remove `is_on` function from `homeassistant.components` (#125104)

* Remove `is_on` method from `homeassistant.components`

* Cleanup test

homeassistant/components/__init__.py

@@ -6,52 +6,3 @@ Component design guidelines:
   format "<DOMAIN>.<OBJECT_ID>".
 - Each component should publish services only under its own domain.
 """
-
-from __future__ import annotations
-
-import logging
-
-from homeassistant.core import HomeAssistant, split_entity_id
-from homeassistant.helpers.frame import report
-from homeassistant.helpers.group import expand_entity_ids
-
-_LOGGER = logging.getLogger(__name__)
-
-
-def is_on(hass: HomeAssistant, entity_id: str | None = None) -> bool:
-    """Load up the module to call the is_on method.
-
-    If there is no entity id given we will check all.
-    """
-    report(
-        (
-            "uses homeassistant.components.is_on."
-            " This is deprecated and will stop working in Home Assistant 2024.9, it"
-            " should be updated to use the function of the platform directly."
-        ),
-        error_if_core=True,
-    )
-
-    if entity_id:
-        entity_ids = expand_entity_ids(hass, [entity_id])
-    else:
-        entity_ids = hass.states.entity_ids()
-
-    for ent_id in entity_ids:
-        domain = split_entity_id(ent_id)[0]
-
-        try:
-            component = getattr(hass.components, domain)
-
-        except ImportError:
-            _LOGGER.error("Failed to call %s.is_on: component not found", domain)
-            continue
-
-        if not hasattr(component, "is_on"):
-            _LOGGER.warning("Integration %s has no is_on method", domain)
-            continue
-
-        if component.is_on(ent_id):
-            return True
-
-    return False

tests/components/homeassistant/test_init.py

@@ -7,7 +7,6 @@ import voluptuous as vol
 import yaml
 
 from homeassistant import config
-import homeassistant.components as comps
 from homeassistant.components.homeassistant import (
     ATTR_ENTRY_ID,
     ATTR_SAFE_MODE,
@@ -46,15 +45,6 @@ from tests.common import (
 )
 
 
-async def test_is_on(hass: HomeAssistant) -> None:
-    """Test is_on method."""
-    with pytest.raises(
-        RuntimeError,
-        match="Detected code that uses homeassistant.components.is_on. This is deprecated and will stop working",
-    ):
-        assert comps.is_on(hass, "light.Bowl")
-
-
 async def test_turn_on_without_entities(hass: HomeAssistant) -> None:
     """Test turn_on method without entities."""
     await async_setup_component(hass, ha.DOMAIN, {})