diff --git a/swh/scheduler/api/server.py b/swh/scheduler/api/server.py
--- a/swh/scheduler/api/server.py
+++ b/swh/scheduler/api/server.py
@@ -1,10 +1,11 @@
-# Copyright (C) 2018-2019  The Software Heritage developers
+# Copyright (C) 2018-2022  The Software Heritage developers
 # See the AUTHORS file at the top-level directory of this distribution
 # License: GNU General Public License version 3, or any later version
 # See top-level LICENSE file for more information
 
 import logging
 import os
+from typing import Dict
 
 from swh.core import config
 from swh.core.api import JSONFormatter, MsgpackFormatter, RPCServerApp
@@ -82,14 +83,14 @@
     return links
 
 
-def load_and_check_config(config_path, type="local"):
+def load_and_check_config(config_path: str, type: str = "postgresql") -> Dict:
     """Check the minimal configuration is set to run the api or raise an
        error explanation.
 
     Args:
-        config_path (str): Path to the configuration file to load
-        type (str): configuration type. For 'local' type, more
-                    checks are done.
+        config_path: Configuration file path to load
+        type: Configuration type, for 'postgresql' type (the default), more checks are
+              done.
 
     Raises:
         Error if the setup is not as expected
@@ -110,7 +111,7 @@
     if not vcfg:
         raise KeyError("Missing '%scheduler' configuration")
 
-    if type == "local":
+    if type == "postgresql":
         cls = vcfg.get("cls")
         if cls not in ("local", "postgresql"):
             raise ValueError(
diff --git a/swh/scheduler/tests/test_server.py b/swh/scheduler/tests/test_server.py
--- a/swh/scheduler/tests/test_server.py
+++ b/swh/scheduler/tests/test_server.py
@@ -54,14 +54,10 @@
 
 
 def test_load_and_check_config_remote_config_local_type_raise(tmpdir):
-    """Configuration without 'local' storage is rejected"""
-    config = {"scheduler": {"cls": "remote"}}
-    config_path = prepare_config_file(tmpdir, config)
-    expected_error = (
-        "The scheduler backend can only be started with a 'postgresql'" " configuration"
-    )
-    with pytest.raises(ValueError, match=expected_error):
-        load_and_check_config(config_path, type="local")
+    """Configuration without 'postgresql' storage is rejected"""
+    config_path = prepare_config_file(tmpdir, {"scheduler": {"cls": "remote"}})
+    with pytest.raises(ValueError, match="'postgresql'"):
+        load_and_check_config(config_path)
 
 
 def test_load_and_check_config_local_incomplete_configuration(tmpdir):
@@ -79,16 +75,17 @@
         load_and_check_config(config_path)
 
 
-def test_load_and_check_config_local_config_fine(tmpdir):
+@pytest.mark.parametrize("clazz", ["local", "postgresql"])
+def test_load_and_check_config_local_config_fine(tmpdir, clazz):
     """Local configuration is fine"""
     config = {
         "scheduler": {
-            "cls": "postgresql",
+            "cls": clazz,
             "db": "db",
         }
     }
     config_path = prepare_config_file(tmpdir, config)
-    cfg = load_and_check_config(config_path, type="local")
+    cfg = load_and_check_config(config_path, type="postgresql")
     assert cfg == config