diff --git a/swh/vault/tests/test_server.py b/swh/vault/tests/test_server.py
--- a/swh/vault/tests/test_server.py
+++ b/swh/vault/tests/test_server.py
@@ -11,6 +11,7 @@
 
 from swh.core.api.serializers import json_dumps, msgpack_dumps, msgpack_loads
 from swh.vault.api.serializers import ENCODERS
+import swh.vault.api.server
 from swh.vault.api.server import app, check_config, make_app_from_configfile
 from swh.vault.tests.test_backend import TEST_SWHID
 
@@ -36,6 +37,11 @@
     """
     app = make_app_from_configfile()
     assert app is not None
+    assert "vault" in app.config
+
+    # Cleanup app
+    del app.config["vault"]
+    swh.vault.api.server.vault = None
 
 
 def test_make_app_from_file(swh_local_vault_config, tmp_path):
@@ -48,12 +54,24 @@
 
     app = make_app_from_configfile(conf_path)
     assert app is not None
+    assert "vault" in app.config
+
+    # Cleanup app
+    del app.config["vault"]
+    swh.vault.api.server.vault = None
 
 
 @pytest.fixture
-def vault_app(swh_vault_config):
+def vault_app(swh_local_vault_config):
+    # Set app config
+    app.config["vault"] = swh_local_vault_config["vault"]
+
     yield app
 
+    # Cleanup app
+    del app.config["vault"]
+    swh.vault.api.server.vault = None
+
 
 @pytest.fixture
 def cli(vault_app):