Fix race in Alexa async_enable_proactive_mode (#92785)

tests/components/alexa/test_config.py

@@ -0,0 +1,21 @@
+"""Test config."""
+import asyncio
+from unittest.mock import patch
+
+from homeassistant.core import HomeAssistant
+
+from .test_common import get_default_config
+
+
+async def test_enable_proactive_mode_in_parallel(hass: HomeAssistant) -> None:
+    """Test enabling proactive mode does not happen in parallel."""
+    config = get_default_config(hass)
+
+    with patch(
+        "homeassistant.components.alexa.config.async_enable_proactive_mode"
+    ) as mock_enable_proactive_mode:
+        await asyncio.gather(
+            config.async_enable_proactive_mode(), config.async_enable_proactive_mode()
+        )
+
+    mock_enable_proactive_mode.assert_awaited_once()