diff --git a/homeassistant/components/watttime/config_flow.py b/homeassistant/components/watttime/config_flow.py
index c2db7847b56..a00ba4c8c86 100644
--- a/homeassistant/components/watttime/config_flow.py
+++ b/homeassistant/components/watttime/config_flow.py
@@ -78,7 +78,7 @@ class ConfigFlow(config_entries.ConfigFlow, domain=DOMAIN):
 
     async def _async_validate_credentials(
         self, username: str, password: str, error_step_id: str, error_schema: vol.Schema
-    ):
+    ) -> FlowResult:
         """Validate input credentials and proceed accordingly."""
         session = aiohttp_client.async_get_clientsession(self.hass)
 
diff --git a/tests/components/watttime/test_config_flow.py b/tests/components/watttime/test_config_flow.py
index 249bd51c4da..672f294c099 100644
--- a/tests/components/watttime/test_config_flow.py
+++ b/tests/components/watttime/test_config_flow.py
@@ -179,7 +179,6 @@ async def test_step_reauth(hass: HomeAssistant, client_login) -> None:
         },
     ).add_to_hass(hass)
 
-    await setup.async_setup_component(hass, "persistent_notification", {})
     with patch(
         "homeassistant.components.watttime.async_setup_entry",
         return_value=True,
@@ -222,7 +221,6 @@ async def test_step_reauth_invalid_credentials(hass: HomeAssistant) -> None:
         },
     ).add_to_hass(hass)
 
-    await setup.async_setup_component(hass, "persistent_notification", {})
     with patch(
         "homeassistant.components.watttime.config_flow.Client.async_login",
         AsyncMock(side_effect=InvalidCredentialsError),