User user = new User();
        user.setName(username);
        return user;
    }

    // Test implementation of AuthenticationChain
    private static class TestAuthenticationChain implements AuthenticationChain {
        int id;
        int updateCallCount = 0;
        int deleteCallCount = 0;
        int changePasswordCallCount = 0;
        int loadCallCount = 0;

        user.setName(username);
        user.setDisplayName(displayName);
        return user;
    }

    // Test implementation of AuthenticationChain for testing
    private static class TestAuthenticationChain implements AuthenticationChain {
        // Track method calls
        List<User> updateCalls = new ArrayList<>();
        List<User> deleteCalls = new ArrayList<>();