public OAuth2Authenticator(IGmailSettings gmailSettings, ICertificatePath certificatePath)
        {
            Check.If(gmailSettings).IsNotNull();
            Check.If(certificatePath).IsNotNull();

            _gmailSettings = gmailSettings;
            _certificatePath = certificatePath;
        }
 public OAuth2Authenticator(IGmailSettings gmailSettings, ICertificatePath certificatePath)
 {
     _gmailSettings = gmailSettings;
     _certificatePath = certificatePath;
 }