Resolve traceback error when using variables in template triggers (#77287)

Co-authored-by: Erik <erik@montnemery.com>

tests/helpers/test_trigger.py

@@ -1,12 +1,13 @@
 """The tests for the trigger helper."""
-from unittest.mock import MagicMock, call, patch
+from unittest.mock import ANY, MagicMock, call, patch
 
 import pytest
 import voluptuous as vol
 
-from homeassistant.core import HomeAssistant, ServiceCall
+from homeassistant.core import HomeAssistant, ServiceCall, callback
 from homeassistant.helpers.trigger import (
     _async_get_trigger_platform,
+    async_initialize_triggers,
     async_validate_trigger_config,
 )
 from homeassistant.setup import async_setup_component
@@ -137,3 +138,62 @@ async def test_trigger_alias(
         "Automation trigger 'My event' triggered by event 'trigger_event'"
         in caplog.text
     )
+
+
+async def test_async_initialize_triggers(
+    hass: HomeAssistant, calls: list[ServiceCall], caplog: pytest.LogCaptureFixture
+) -> None:
+    """Test async_initialize_triggers with different action types."""
+
+    log_cb = MagicMock()
+
+    action_calls = []
+
+    trigger_config = await async_validate_trigger_config(
+        hass,
+        [
+            {
+                "platform": "event",
+                "event_type": ["trigger_event"],
+                "variables": {
+                    "name": "Paulus",
+                    "via_event": "{{ trigger.event.event_type }}",
+                },
+            }
+        ],
+    )
+
+    async def async_action(*args):
+        action_calls.append([*args])
+
+    @callback
+    def cb_action(*args):
+        action_calls.append([*args])
+
+    def non_cb_action(*args):
+        action_calls.append([*args])
+
+    for action in (async_action, cb_action, non_cb_action):
+        action_calls = []
+
+        unsub = await async_initialize_triggers(
+            hass,
+            trigger_config,
+            action,
+            "test",
+            "",
+            log_cb,
+        )
+        await hass.async_block_till_done()
+
+        hass.bus.async_fire("trigger_event")
+        await hass.async_block_till_done()
+        await hass.async_block_till_done()
+
+        assert len(action_calls) == 1
+        assert action_calls[0][0]["name"] == "Paulus"
+        assert action_calls[0][0]["via_event"] == "trigger_event"
+        log_cb.assert_called_once_with(ANY, "Initialized trigger")
+
+        log_cb.reset_mock()
+        unsub()