Avoid using implementation internal to trigger events (#38041)

This uses the moxking in fixture to trigger events.

tests/components/rfxtrx/test_init.py

@@ -1,11 +1,9 @@
 """The tests for the Rfxtrx component."""
 
-from homeassistant.components import rfxtrx
+from homeassistant.components.rfxtrx.const import EVENT_RFXTRX_EVENT
 from homeassistant.core import callback
 from homeassistant.setup import async_setup_component
 
-from . import _signal_event
-
 from tests.async_mock import call
 
 
@@ -55,7 +53,7 @@ async def test_invalid_config(hass):
     )
 
 
-async def test_fire_event(hass):
+async def test_fire_event(hass, rfxtrx):
     """Test fire event."""
     assert await async_setup_component(
         hass,
@@ -66,8 +64,8 @@ async def test_fire_event(hass):
                 + "-RFXCOM_RFXtrx433_A1Y0NJGR-if00-port0",
                 "automatic_add": True,
                 "devices": {
-                    "0b1100cd0213c7f210010f51": {rfxtrx.CONF_FIRE_EVENT: True},
-                    "0716000100900970": {rfxtrx.CONF_FIRE_EVENT: True},
+                    "0b1100cd0213c7f210010f51": {"fire_event": True},
+                    "0716000100900970": {"fire_event": True},
                 },
             }
         },
@@ -83,10 +81,10 @@ async def test_fire_event(hass):
         assert event.event_type == "rfxtrx_event"
         calls.append(event.data)
 
-    hass.bus.async_listen(rfxtrx.const.EVENT_RFXTRX_EVENT, record_event)
+    hass.bus.async_listen(EVENT_RFXTRX_EVENT, record_event)
 
-    await _signal_event(hass, "0b1100cd0213c7f210010f51")
-    await _signal_event(hass, "0716000100900970")
+    await rfxtrx.signal("0b1100cd0213c7f210010f51")
+    await rfxtrx.signal("0716000100900970")
 
     assert calls == [
         {