test for deactivating super admin

tests/test_webinterface.py

@@ -210,6 +210,12 @@ def test_activate_deactivate_user(temp_user, client_authenticated):
     assert user is not None
     assert user.active
 
+    # test deactivating super admin
+    response = client_authenticated.get(f"/admin_toggle_active/gandalf",
+                             follow_redirects=True)
+    assert 'Super-Admins können nicht deaktiviert werden!' \
+           in response.data.decode()
+
 
 def test_delete_admin(temp_user, client_authenticated):
     # first we test deleting a non-existing user