Add ping method to auth engines to determine if they are reachable

data/users/test/test_users.py

@@ -6,6 +6,7 @@ from data.database import model
 from data.users.federated import DISABLED_MESSAGE
 from test.test_ldap import mock_ldap
 from test.test_keystone_auth import fake_keystone
+from test.test_external_jwt_authn import fake_jwt
 
 from test.fixtures import *
 
@@ -34,3 +35,16 @@ def test_auth_createuser(auth_system_builder, user1, user2, config, app):
       new_user, err = auth.verify_and_link_user(*user2)
       assert new_user is None
       assert err == DISABLED_MESSAGE
+
+
+@pytest.mark.parametrize('auth_system_builder,auth_kwargs', [
+  (mock_ldap, {}),
+  (fake_keystone, {'version': 3}),
+  (fake_keystone, {'version': 2}),
+  (fake_jwt, {}),
+])
+def test_ping(auth_system_builder, auth_kwargs, app):
+  with auth_system_builder(**auth_kwargs) as auth:
+    status, err = auth.ping()
+    assert status
+    assert err is None