test(homeassistant): prevent unit tests from calling live instances

Two tests made real HTTP calls to homeassistant.local:8123 — on a LAN
with an actual Home Assistant instance they could turn on real lights,
and otherwise burned ~10s in network timeouts. Replace with AsyncMock at
_async_call_service and assert the exact production call signature
(domain, service, entity_id, data). 35 pass in ~0.2s.

Salvaged from PR #72634 by @jeeves-assistant.

Co-authored-by: Jeeves Assistant <jeevesassistant00@gmail.com>

tests/tools/test_homeassistant_tool.py

@@ -5,7 +5,7 @@ handler validation, and availability gating.
 """
 
 import json
-from unittest.mock import patch
+from unittest.mock import AsyncMock, patch
 
 import pytest
 
@@ -141,16 +141,20 @@ class TestDomainBlocklist:
         assert "error" in result
         assert "blocked" in result["error"].lower()
 
-    def test_safe_domain_not_blocked(self):
-        """Safe domains like 'light' should not be blocked (will fail on network, not blocklist)."""
-        # This will try to make a real HTTP call and fail, but the important thing
-        # is it does NOT return a "blocked" error
+    @patch("tools.homeassistant_tool._async_call_service", new_callable=AsyncMock)
+    def test_safe_domain_not_blocked(self, mock_call_service):
+        """Safe domains like ``light`` reach the service-call layer."""
+        mock_call_service.return_value = {"success": True}
         result = json.loads(_handle_call_service({
             "domain": "light", "service": "turn_on", "entity_id": "light.test"
         }))
-        # Should fail with a network/connection error, not a "blocked" error
-        if "error" in result:
-            assert "blocked" not in result["error"].lower()
+        assert result["result"]["success"] is True
+        mock_call_service.assert_awaited_once_with(
+            "light",
+            "turn_on",
+            "light.test",
+            None,
+        )
 
     def test_blocked_domains_include_shell_command(self):
         assert "shell_command" in _BLOCKED_DOMAINS
@@ -179,14 +183,20 @@ class TestEntityIdValidation:
         assert _ENTITY_ID_RE.match("../api/config") is None
 
 
-    def test_call_service_allows_no_entity_id(self):
+    @patch("tools.homeassistant_tool._async_call_service", new_callable=AsyncMock)
+    def test_call_service_allows_no_entity_id(self, mock_call_service):
         """Some services (like scene.turn_on) don't need entity_id."""
-        # Will fail on network, but should NOT fail on entity_id validation
+        mock_call_service.return_value = {"success": True}
         result = json.loads(_handle_call_service({
             "domain": "scene", "service": "turn_on"
         }))
-        if "error" in result:
-            assert "Invalid entity_id" not in result["error"]
+        assert result["result"]["success"] is True
+        mock_call_service.assert_awaited_once_with(
+            "scene",
+            "turn_on",
+            None,
+            None,
+        )
 
 
 # ---------------------------------------------------------------------------