Ensure custom integrations are assigned the custom IQS scale (home-as…

…sistant#131795)

homeassistant/loader.py

@@ -830,6 +830,9 @@ def loggers(self) -> list[str] | None:
     @cached_property
     def quality_scale(self) -> str | None:
         """Return Integration Quality Scale."""
+        # Custom integrations default to "custom" quality scale.
+        if not self.is_built_in or self.overwrites_built_in:
+            return "custom"
         return self.manifest.get("quality_scale")
 
     @cached_property

tests/test_loader.py

@@ -547,6 +547,7 @@ def test_integration_properties(hass: HomeAssistant) -> None:
             ],
             "mqtt": ["hue/discovery"],
             "version": "1.0.0",
+            "quality_scale": "gold",
         },
     )
     assert integration.name == "Philips Hue"
@@ -585,6 +586,7 @@ def test_integration_properties(hass: HomeAssistant) -> None:
     assert integration.is_built_in is True
     assert integration.overwrites_built_in is False
     assert integration.version == "1.0.0"
+    assert integration.quality_scale == "gold"
 
     integration = loader.Integration(
         hass,
@@ -595,6 +597,7 @@ def test_integration_properties(hass: HomeAssistant) -> None:
             "domain": "hue",
             "dependencies": ["test-dep"],
             "requirements": ["test-req==1.0.0"],
+            "quality_scale": "gold",
         },
     )
     assert integration.is_built_in is False
@@ -607,6 +610,7 @@ def test_integration_properties(hass: HomeAssistant) -> None:
     assert integration.ssdp is None
     assert integration.mqtt is None
     assert integration.version is None
+    assert integration.quality_scale == "custom"
 
     integration = loader.Integration(
         hass,