Use config_entries.SOURCE_* constants (#49631)

tests/components/withings/test_config_flow.py

@@ -1,6 +1,7 @@
 """Tests for config flow."""
 from aiohttp.test_utils import TestClient
 
+from homeassistant import config_entries
 from homeassistant.components.withings import const
 from homeassistant.config import async_process_ha_core_config
 from homeassistant.const import (
@@ -58,7 +59,8 @@ async def test_config_reauth_profile(
     config_entry.add_to_hass(hass)
 
     result = await hass.config_entries.flow.async_init(
-        const.DOMAIN, context={"source": "reauth", "profile": "person0"}
+        const.DOMAIN,
+        context={"source": config_entries.SOURCE_REAUTH, "profile": "person0"},
     )
     assert result
     assert result["type"] == "form"