song-of-the-day/song_of_the_day/Auth/LdapAuthenticationService.cs

public class LdapAuthenticationService : IAuthenticationService
{
    private readonly IConfiguration _configuration;
    private LdapIntegration _ldapIntegration;

    public LdapAuthenticationService(IConfiguration configuration, LdapIntegration ldapIntegration)
    {
        _configuration = configuration;
        _ldapIntegration = ldapIntegration;
    }

    public bool Authenticate(string username, string password)
    {
        return _ldapIntegration == null ? false : _ldapIntegration.TestLogin(username, password);
    }
}