Default to recorder db for SQL integration (#85436)

Co-authored-by: J. Nick Koston <nick@koston.org>

tests/components/sql/test_util.py

@@ -0,0 +1,25 @@
+"""Test the sql utils."""
+from unittest.mock import AsyncMock
+
+from homeassistant.components.recorder import get_instance
+from homeassistant.components.sql.util import resolve_db_url
+from homeassistant.core import HomeAssistant
+
+
+async def test_resolve_db_url_when_none_configured(
+    recorder_mock: AsyncMock,
+    hass: HomeAssistant,
+):
+    """Test return recorder db_url if provided db_url is None."""
+    db_url = None
+    resolved_url = resolve_db_url(hass, db_url)
+
+    assert resolved_url == get_instance(hass).db_url
+
+
+async def test_resolve_db_url_when_configured(hass: HomeAssistant):
+    """Test return provided db_url if it's set."""
+    db_url = "mssql://"
+    resolved_url = resolve_db_url(hass, db_url)
+
+    assert resolved_url == db_url