How to use DescribedAs class of org.hamcrest.core package

/*
* Created on Feb 21, 2005
*
*/

import java.security.Security;
import java.util.Properties;

import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

public class GoogleTest {

    private static final String SMTP_HOST_NAME = "smtp.gmail.com";
    private static final String SMTP_PORT = "465";
    private static final String emailMsgTxt = "Test Message Contents";
    private static final String emailSubjectTxt = "A test from gmail";
    private static final String emailFromAddress = "";
    private static final String SSL_FACTORY = "javax.net.ssl.SSLSocketFactory";
    private static final String[] sendTo = { "" };


    public static void main(String args[]) throws Exception {

        Security.addProvider(new com.sun.net.ssl.internal.ssl.Provider());

        new GoogleTest().sendSSLMessage(sendTo, emailSubjectTxt,
            emailMsgTxt, emailFromAddress);
        System.out.println("Sucessfully mail to All Users");
    }

    public void sendSSLMessage(String recipients[], String subject,
                               String message, String from) throws MessagingException {
        boolean debug = true;

        Properties props = new Properties();
        props.put("mail.smtp.host", SMTP_HOST_NAME);
        props.put("mail.smtp.auth", "true");
        props.put("mail.debug", "true");
        props.put("mail.smtp.port", SMTP_PORT);
        props.put("mail.smtp.socketFactory.port", SMTP_PORT);
        props.put("mail.smtp.socketFactory.class", SSL_FACTORY);
        props.put("mail.smtp.socketFactory.fallback", "false");

        Session session = Session.getDefaultInstance(props,
            new javax.mail.Authenticator() {
                protected PasswordAuthentication getPasswordAuthentication() {
                    return new PasswordAuthentication("xxxxxx", "xxxxxx");
            }
        });

        session.setDebug(debug);

        Message msg = new MimeMessage(session);
        InternetAddress addressFrom = new InternetAddress(from);
        msg.setFrom(addressFrom);

        InternetAddress[] addressTo = new InternetAddress[recipients.length];
        for (int i = 0; i < recipients.length; i++) {
            addressTo[i] = new InternetAddress(recipients);
        }
        msg.setRecipients(Message.RecipientType.TO, addressTo);

        // Setting the Subject and Content Type
        msg.setSubject(subject);
        msg.setContent(message, "text/plain");
        Transport.send(msg);
    }
}

import javax.mail.*;
import javax.mail.internet.*;
import java.util.*;

public class MailSender
{
    final String senderEmailID = "typesendermailid@gmail.com";
    final String senderPassword = "typesenderpassword";
    final String emailSMTPserver = "smtp.gmail.com";
    final String emailServerPort = "465";
    String receiverEmailID = null;
    static String emailSubject = "Test Mail";
    static String emailBody = ":)";

    public MailSender(
            String receiverEmailID,
            String emailSubject,
            String emailBody
    ) {
        this.receiverEmailID=receiverEmailID;
        this.emailSubject=emailSubject;
        this.emailBody=emailBody;
        Properties props = new Properties();
        props.put("mail.smtp.user",senderEmailID);
        props.put("mail.smtp.host", emailSMTPserver);
        props.put("mail.smtp.port", emailServerPort);
        props.put("mail.smtp.starttls.enable", "true");
        props.put("mail.smtp.auth", "true");
        props.put("mail.smtp.socketFactory.port", emailServerPort);
        props.put("mail.smtp.socketFactory.class","javax.net.ssl.SSLSocketFactory");
        props.put("mail.smtp.socketFactory.fallback", "false");
        SecurityManager security = System.getSecurityManager();
        try {
            Authenticator auth = new SMTPAuthenticator();
            Session session = Session.getInstance(props, auth);
            MimeMessage msg = new MimeMessage(session);
            msg.setText(emailBody);
            msg.setSubject(emailSubject);
            msg.setFrom(new InternetAddress(senderEmailID));
            msg.addRecipient(Message.RecipientType.TO,
                    new InternetAddress(receiverEmailID));
            Transport.send(msg);
            System.out.println("Message send Successfully:)");
        }
        catch (Exception mex)
        {
            mex.printStackTrace();
        }
    }

    public class SMTPAuthenticator extends javax.mail.Authenticator
    {
        public PasswordAuthentication getPasswordAuthentication()
        {
            return new PasswordAuthentication(senderEmailID, senderPassword);
        }
    }

    public static void main(String[] args)
    {
        MailSender mailSender=new
            MailSender("typereceivermailid@gmail.com",emailSubject,emailBody);
    }
}