Add input_datetime reload service. (#29581)

* Add input_datetime reload service.

* Add reload service test.

tests/components/input_datetime/test_init.py

@@ -2,20 +2,23 @@
 # pylint: disable=protected-access
 import asyncio
 import datetime
+from unittest.mock import patch
 
 import pytest
 import voluptuous as vol
 
-from homeassistant.core import CoreState, State, Context
-from homeassistant.setup import async_setup_component
 from homeassistant.components.input_datetime import (
-    DOMAIN,
     ATTR_DATE,
     ATTR_DATETIME,
     ATTR_TIME,
+    DOMAIN,
+    SERVICE_RELOAD,
     SERVICE_SET_DATETIME,
 )
 from homeassistant.const import ATTR_ENTITY_ID
+from homeassistant.core import Context, CoreState, State
+from homeassistant.exceptions import Unauthorized
+from homeassistant.setup import async_setup_component
 
 from tests.common import mock_restore_cache
 
@@ -310,3 +313,65 @@ async def test_input_datetime_context(hass, hass_admin_user):
     assert state2 is not None
     assert state.state != state2.state
     assert state2.context.user_id == hass_admin_user.id
+
+
+async def test_reload(hass, hass_admin_user, hass_read_only_user):
+    """Test reload service."""
+    count_start = len(hass.states.async_entity_ids())
+
+    assert await async_setup_component(
+        hass,
+        DOMAIN,
+        {
+            DOMAIN: {
+                "dt1": {"has_time": False, "has_date": True, "initial": "2019-1-1"},
+            }
+        },
+    )
+
+    assert count_start + 1 == len(hass.states.async_entity_ids())
+
+    state_1 = hass.states.get("input_datetime.dt1")
+    state_2 = hass.states.get("input_datetime.dt2")
+
+    dt_obj = datetime.datetime(2019, 1, 1, 0, 0)
+    assert state_1 is not None
+    assert state_2 is None
+    assert str(dt_obj.date()) == state_1.state
+
+    with patch(
+        "homeassistant.config.load_yaml_config_file",
+        autospec=True,
+        return_value={
+            DOMAIN: {
+                "dt1": {"has_time": True, "has_date": False, "initial": "23:32"},
+                "dt2": {"has_time": True, "has_date": True},
+            }
+        },
+    ):
+        with patch("homeassistant.config.find_config_file", return_value=""):
+            with pytest.raises(Unauthorized):
+                await hass.services.async_call(
+                    DOMAIN,
+                    SERVICE_RELOAD,
+                    blocking=True,
+                    context=Context(user_id=hass_read_only_user.id),
+                )
+            await hass.services.async_call(
+                DOMAIN,
+                SERVICE_RELOAD,
+                blocking=True,
+                context=Context(user_id=hass_admin_user.id),
+            )
+            await hass.async_block_till_done()
+
+    assert count_start + 2 == len(hass.states.async_entity_ids())
+
+    state_1 = hass.states.get("input_datetime.dt1")
+    state_2 = hass.states.get("input_datetime.dt2")
+
+    dt_obj = datetime.datetime(2019, 1, 1, 23, 32)
+    assert state_1 is not None
+    assert state_2 is not None
+    assert str(dt_obj.time()) == state_1.state
+    assert str(datetime.datetime(1970, 1, 1, 0, 0)) == state_2.state