* @param roleList The list to add role names to.
     * @param id The group ID to process.
     */
    protected void processParentGroup(final EntraIdUser user, final List<String> groupList, final List<String> roleList, final String id) {
        processParentGroup(user, groupList, roleList, id, 0);
    }

    /**
     * Processes parent group information for nested groups with depth tracking.

        // Test the overload that doesn't take depth parameter
        // It should call the depth-tracking version with depth 0
        try {
            authenticator.processParentGroup(null, groupList, roleList, "test-id");
        } catch (Exception e) {
            // Expected due to null user
        }

        // Verify lists are still valid
        assertNotNull(groupList);