Add config flow for switch.light (#67447)

* Add config flow for switch.light

* Refactor according to code review

* Setup light switch from config entry

* Improve async_resolve_entity

* Prepare for multiple steps

* Remove name and options flow from switch light

* Check type before adding description to schema keys

* Remove options flow enabler

* Copy name from the switch

* Move helper flows to new file

* Improve test coverage

* Fix name

* Remove dead code from abstract method

* Remove manifest 'helper' option

* Validate registry entry id before forwarding to light platform

* Improve test

* Add translations

* Improve config entry setup

* Log when config entry fails setup

* Update homeassistant/components/switch/__init__.py

Co-authored-by: Paulus Schoutsen <balloob@gmail.com>

Co-authored-by: Paulus Schoutsen <balloob@gmail.com>

tests/components/switch/test_light.py

@@ -5,8 +5,12 @@ from homeassistant.components.light import (
     ATTR_SUPPORTED_COLOR_MODES,
     COLOR_MODE_ONOFF,
 )
+from homeassistant.components.switch.const import DOMAIN as SWITCH_DOMAIN
+from homeassistant.core import HomeAssistant
+from homeassistant.helpers import entity_registry as er
 from homeassistant.setup import async_setup_component
 
+from tests.common import MockConfigEntry
 from tests.components.light import common
 from tests.components.switch import common as switch_common
 
@@ -96,3 +100,69 @@ async def test_switch_service_calls(hass):
 
     assert hass.states.get("switch.decorative_lights").state == "on"
     assert hass.states.get("light.light_switch").state == "on"
+
+
+async def test_config_entry(hass: HomeAssistant):
+    """Test light switch setup from config entry."""
+    config_entry = MockConfigEntry(
+        data={},
+        domain=SWITCH_DOMAIN,
+        options={"entity_id": "switch.abc"},
+        title="ABC",
+    )
+
+    config_entry.add_to_hass(hass)
+
+    assert await hass.config_entries.async_setup(config_entry.entry_id)
+    await hass.async_block_till_done()
+
+    assert SWITCH_DOMAIN in hass.config.components
+
+    state = hass.states.get("light.abc")
+    assert state.state == "unavailable"
+    # Name copied from config entry title
+    assert state.name == "ABC"
+
+    # Check the light is added to the entity registry
+    registry = er.async_get(hass)
+    entity_entry = registry.async_get("light.abc")
+    assert entity_entry.unique_id == config_entry.entry_id
+
+
+async def test_config_entry_uuid(hass: HomeAssistant):
+    """Test light switch setup from config entry with entity registry id."""
+    registry = er.async_get(hass)
+    registry_entry = registry.async_get_or_create("switch", "test", "unique")
+
+    config_entry = MockConfigEntry(
+        data={},
+        domain=SWITCH_DOMAIN,
+        options={"entity_id": registry_entry.id},
+        title="ABC",
+    )
+
+    config_entry.add_to_hass(hass)
+
+    assert await hass.config_entries.async_setup(config_entry.entry_id)
+    await hass.async_block_till_done()
+
+    assert hass.states.get("light.abc")
+
+
+async def test_config_entry_unregistered_uuid(hass: HomeAssistant):
+    """Test light switch setup from config entry with unknown entity registry id."""
+    fake_uuid = "a266a680b608c32770e6c45bfe6b8411"
+
+    config_entry = MockConfigEntry(
+        data={},
+        domain=SWITCH_DOMAIN,
+        options={"entity_id": fake_uuid},
+        title="ABC",
+    )
+
+    config_entry.add_to_hass(hass)
+
+    assert not await hass.config_entries.async_setup(config_entry.entry_id)
+    await hass.async_block_till_done()
+
+    assert len(hass.states.async_all()) == 0