Make notifiers of Alert optional (#80209)

homeassistant/components/alert/__init__.py

@@ -68,7 +68,9 @@ ALERT_SCHEMA = vol.Schema(
         vol.Optional(CONF_DONE_MESSAGE): cv.template,
         vol.Optional(CONF_TITLE): cv.template,
         vol.Optional(CONF_DATA): dict,
-        vol.Required(CONF_NOTIFIERS): vol.All(cv.ensure_list, [cv.string]),
+        vol.Optional(CONF_NOTIFIERS, default=list): vol.All(
+            cv.ensure_list, [cv.string]
+        ),
     }
 )
 
@@ -269,6 +271,9 @@ class Alert(Entity):
 
     async def _send_notification_message(self, message: Any) -> None:
 
+        if not self._notifiers:
+            return
+
         msg_payload = {ATTR_MESSAGE: message}
 
         if self._title_template is not None:

tests/components/alert/test_init.py

@@ -28,7 +28,7 @@ from homeassistant.const import (
     STATE_OFF,
     STATE_ON,
 )
-from homeassistant.core import callback
+from homeassistant.core import HomeAssistant, callback
 from homeassistant.setup import async_setup_component
 
 NAME = "alert_test"
@@ -223,6 +223,42 @@ async def test_notification(hass):
     assert len(events) == 2
 
 
+async def test_no_notifiers(hass: HomeAssistant) -> None:
+    """Test we send no notifications when there are not no."""
+    events = []
+
+    @callback
+    def record_event(event):
+        """Add recorded event to set."""
+        events.append(event)
+
+    hass.services.async_register(notify.DOMAIN, NOTIFIER, record_event)
+
+    assert await async_setup_component(
+        hass,
+        DOMAIN,
+        {
+            DOMAIN: {
+                NAME: {
+                    CONF_NAME: NAME,
+                    CONF_ENTITY_ID: TEST_ENTITY,
+                    CONF_STATE: STATE_ON,
+                    CONF_REPEAT: 30,
+                }
+            }
+        },
+    )
+    assert len(events) == 0
+
+    hass.states.async_set("sensor.test", STATE_ON)
+    await hass.async_block_till_done()
+    assert len(events) == 0
+
+    hass.states.async_set("sensor.test", STATE_OFF)
+    await hass.async_block_till_done()
+    assert len(events) == 0
+
+
 async def test_sending_non_templated_notification(hass, mock_notifier):
     """Test notifications."""
     assert await async_setup_component(hass, DOMAIN, TEST_CONFIG)