Allow input_* and timer component setup without config (#30772)

* Allow input_boolean setup without config.

* Allow input_number setup without config.

* Allow input_select setup without config.

* Allow input_text setup without config.

* Allow timer setup without config.

tests/components/input_boolean/test_init.py

@@ -333,3 +333,22 @@ async def test_ws_delete(hass, hass_ws_client, storage_setup):
     state = hass.states.get(input_entity_id)
     assert state is None
     assert ent_reg.async_get_entity_id(DOMAIN, DOMAIN, input_id) is None
+
+
+async def test_setup_no_config(hass, hass_admin_user):
+    """Test component setup with no config."""
+    count_start = len(hass.states.async_entity_ids())
+    assert await async_setup_component(hass, DOMAIN, {})
+
+    with patch(
+        "homeassistant.config.load_yaml_config_file", autospec=True, return_value={}
+    ):
+        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 == len(hass.states.async_entity_ids())