Improve config entry has already been setup error message (#117091)

homeassistant/helpers/entity_component.py

@@ -182,7 +182,10 @@ class EntityComponent(Generic[_EntityT]):
         key = config_entry.entry_id
 
         if key in self._platforms:
-            raise ValueError("Config entry has already been setup!")
+            raise ValueError(
+                f"Config entry {config_entry.title} ({key}) for "
+                f"{platform_type}.{self.domain} has already been setup!"
+            )
 
         self._platforms[key] = self._async_init_entity_platform(
             platform_type,

tests/helpers/test_entity_component.py

@@ -3,6 +3,7 @@
 from collections import OrderedDict
 from datetime import timedelta
 import logging
+import re
 from unittest.mock import AsyncMock, Mock, patch
 
 from freezegun import freeze_time
@@ -363,7 +364,13 @@ async def test_setup_entry_fails_duplicate(hass: HomeAssistant) -> None:
 
     assert await component.async_setup_entry(entry)
 
-    with pytest.raises(ValueError):
+    with pytest.raises(
+        ValueError,
+        match=re.escape(
+            f"Config entry Mock Title ({entry.entry_id}) for "
+            "entry_domain.test_domain has already been setup!"
+        ),
+    ):
         await component.async_setup_entry(entry)