Add conversation agent selector, use in conversation.process service (#95462)

homeassistant/components/conversation/services.yaml

@@ -20,4 +20,4 @@ process:
       description: Assist engine to process your request
       example: homeassistant
       selector:
-        text:
+        conversation_agent:

homeassistant/helpers/selector.py

@@ -500,6 +500,34 @@ class ConstantSelector(Selector[ConstantSelectorConfig]):
         return self.config["value"]
 
 
+class ConversationAgentSelectorConfig(TypedDict, total=False):
+    """Class to represent a conversation agent selector config."""
+
+    language: str
+
+
+@SELECTORS.register("conversation_agent")
+class COnversationAgentSelector(Selector[ConversationAgentSelectorConfig]):
+    """Selector for a conversation agent."""
+
+    selector_type = "conversation_agent"
+
+    CONFIG_SCHEMA = vol.Schema(
+        {
+            vol.Optional("language"): str,
+        }
+    )
+
+    def __init__(self, config: ConversationAgentSelectorConfig) -> None:
+        """Instantiate a selector."""
+        super().__init__(config)
+
+    def __call__(self, data: Any) -> str:
+        """Validate the passed selection."""
+        agent: str = vol.Schema(str)(data)
+        return agent
+
+
 class DateSelectorConfig(TypedDict):
     """Class to represent a date selector config."""
 

tests/helpers/test_selector.py

@@ -979,3 +979,25 @@ def test_constant_selector_schema_error(schema) -> None:
     """Test constant selector."""
     with pytest.raises(vol.Invalid):
         selector.validate_selector({"constant": schema})
+
+
+@pytest.mark.parametrize(
+    ("schema", "valid_selections", "invalid_selections"),
+    (
+        (
+            {},
+            ("home_assistant", "2j4hp3uy4p87wyrpiuhk34"),
+            (None, True, 1),
+        ),
+        (
+            {"language": "nl"},
+            ("home_assistant", "2j4hp3uy4p87wyrpiuhk34"),
+            (None, True, 1),
+        ),
+    ),
+)
+def test_conversation_agent_selector_schema(
+    schema, valid_selections, invalid_selections
+) -> None:
+    """Test conversation agent selector."""
+    _test_selector("conversation_agent", schema, valid_selections, invalid_selections)