Add quality scale hassfest check for config-entry-unload (#131720)

* Add dataclass to hassfest quality_scale

* Add basic check for config-entry-unloading

* Future-proof with a list of errors

script/hassfest/quality_scale_validation/__init__.py

@@ -0,0 +1,15 @@
+"""Integration quality scale rules."""
+
+from typing import Protocol
+
+from script.hassfest.model import Integration
+
+
+class RuleValidationProtocol(Protocol):
+    """Protocol for rule validation."""
+
+    def validate(self, integration: Integration) -> list[str] | None:
+        """Validate a quality scale rule.
+
+        Returns error (if any).
+        """

script/hassfest/quality_scale_validation/config_entry_unloading.py

@@ -0,0 +1,26 @@
+"""Enforce that the integration implements entry unloading."""
+
+import ast
+
+from script.hassfest.model import Integration
+
+
+def _has_async_function(module: ast.Module, name: str) -> bool:
+    """Test if the module defines a function."""
+    return any(
+        type(item) is ast.AsyncFunctionDef and item.name == name for item in module.body
+    )
+
+
+def validate(integration: Integration) -> list[str] | None:
+    """Validate that the integration has a config flow."""
+
+    init_file = integration.path / "__init__.py"
+    init = ast.parse(init_file.read_text())
+
+    if not _has_async_function(init, "async_unload_entry"):
+        return [
+            "Integration does not support config entry unloading "
+            "(is missing `async_unload_entry` in __init__.py)"
+        ]
+    return None