Increase test coverage for rfxtrx integration (#39340)

* Increase switch coverage

* Increase binary sensor coverage

* Final improvements

* Remove debug statement

* Adjust test duplicate cover

* Remove None return test

* Assert on length of conf_entries

Co-authored-by: Chris Talkington <chris@talkingtontech.com>

Co-authored-by: Chris Talkington <chris@talkingtontech.com>

tests/components/rfxtrx/test_switch.py

@@ -3,6 +3,7 @@ from unittest.mock import call
 
 import pytest
 
+from homeassistant.components.rfxtrx import DOMAIN
 from homeassistant.core import State
 from homeassistant.setup import async_setup_component
 
@@ -151,3 +152,24 @@ async def test_discover_rfy_sun_switch(hass, rfxtrx_automatic):
     state = hass.states.get("switch.rfy_030101_1")
     assert state
     assert state.state == "on"
+
+
+async def test_unknown_event_code(hass, rfxtrx):
+    """Test with 3 switches."""
+    assert await async_setup_component(
+        hass,
+        "rfxtrx",
+        {
+            "rfxtrx": {
+                "device": "abcd",
+                "devices": {"1234567890": {}},
+            }
+        },
+    )
+    await hass.async_block_till_done()
+
+    conf_entries = hass.config_entries.async_entries(DOMAIN)
+    assert len(conf_entries) == 1
+
+    entry = conf_entries[0]
+    assert entry.state == "loaded"