Fix bluetooth tests (#150978)

tests/conftest.py

@@ -1846,19 +1846,30 @@ def mock_bleak_scanner_start() -> Generator[MagicMock]:
 
     # Late imports to avoid loading bleak unless we need it
 
-    from habluetooth import scanner as bluetooth_scanner  # noqa: PLC0415
+    from habluetooth import (  # noqa: PLC0415
+        manager as bluetooth_manager,
+        scanner as bluetooth_scanner,
+    )
 
     # We need to drop the stop method from the object since we patched
     # out start and this fixture will expire before the stop method is called
     # when EVENT_HOMEASSISTANT_STOP is fired.
     # pylint: disable-next=c-extension-no-member
     bluetooth_scanner.OriginalBleakScanner.stop = AsyncMock()  # type: ignore[assignment]
+
+    # Mock BlueZ management controller
+    mock_mgmt_bluetooth_ctl = Mock()
+    mock_mgmt_bluetooth_ctl.setup = AsyncMock(side_effect=OSError("Mocked error"))
+
     with (
         patch.object(
             bluetooth_scanner.OriginalBleakScanner,  # pylint: disable=c-extension-no-member
             "start",
         ) as mock_bleak_scanner_start,
         patch.object(bluetooth_scanner, "HaScanner"),
+        patch.object(
+            bluetooth_manager, "MGMTBluetoothCtl", return_value=mock_mgmt_bluetooth_ctl
+        ),
     ):
         yield mock_bleak_scanner_start