MIMEMessage 和 MIMEMessage 模拟测试用例因 EmailUtil 上的断言错误而失败

我想要实现的目标- 我为 Spring MVC 应用程序编写的 EmailUtil 的简单单元测试。我被卡住的地方- 虽然我已经嘲笑了 MIMEmessage 和 JavaMailSender，但测试用例在 MimeMessageHelper.set**** 方法中失败了。

感谢您对此的任何帮助，因为即使使用 PowerMock 也尝试了几种不同的方法，但最近几天没有运气。

电子邮件实用程序

import java.util.List;

import javax.activation.DataSource;
import javax.mail.MessagingException;
import javax.mail.internet.MimeMessage;
import javax.mail.util.ByteArrayDataSource;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.mail.javamail.MimeMessageHelper;

import com.dashboard.domain.Attachment;
import com.dashboard.domain.Email;

public class EmailUtil {

    private static final Logger LOGGER = LoggerFactory.getLogger(EmailUtil.class
            .getName());

    /**
     * Private constructor to make sure that no one creating instance
     */
    private EmailUtil() {

    }

    /**
     * Functionality to send the mail. This method used the mail sender
     * configuration from spring-context file.
     * 
     * @param email
     * @param mailSender
     * @throws MessagingException
     */
    public static void sendEmail(JavaMailSender mailSender, Email email)
            throws MessagingException {

        LOGGER.info("Start of the method: sendEmail");
        MimeMessage mimeMessage = mailSender.createMimeMessage();
        // use the true flag to indicate you need a multi part message
        boolean hasAttachments = email.getAttachments() != null
                && !email.getAttachments().isEmpty();
        LOGGER.info(" mimeMessage - {} ",mimeMessage);
        MimeMessageHelper helper = new MimeMessageHelper(mimeMessage,
                hasAttachments);
        LOGGER.info(" MimeMessageHelper - {} ",helper);
        helper.setTo(email.getTo());
        helper.setFrom(email.getFrom());
        helper.setCc(email.getCc());
        helper.setSubject(email.getSubject());
        helper.setText(email.getText(), true);

        List<Attachment> attachments = email.getAttachments();
        if (!attachments.isEmpty()) {
            for (Attachment attachment : attachments) {
                String filename = attachment.getFilename();
                DataSource dataSource = new ByteArrayDataSource(
                        attachment.getData(), attachment.getMimeType());
                if (attachment.isInline()) {
                    helper.addInline(filename, dataSource);
                } else {
                    helper.addAttachment(filename, dataSource);
                }
            }
        }
        mailSender.send(mimeMessage);
        LOGGER.info("End of the method: sendEmail");
    }


}

EmailUtilTest.Java

import static org.easymock.EasyMock.expect;

import javax.mail.Address;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMessage.RecipientType;

import org.easymock.EasyMock;
import org.easymock.Mock;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.powermock.modules.junit4.PowerMockRunner;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.mail.javamail.MimeMessageHelper;

import com.dashboard.domain.ApplicationConstant;
import com.dashboard.domain.Email;

/**
 * PowerMockDemo
 * @author s.arumugam
 *
 */
@RunWith(PowerMockRunner.class)
@PrepareForTest(EmailUtil.class)
public class EmailUtilTest {

    Email email = new Email();

    @Mock
    JavaMailSender javaMailSender;

    @Mock
    MimeMessage mimeMessage;

    @Mock
    MimeMessageHelper mimeMessageHelper;

    @Before
    public void initList() {
        email.setFrom(ApplicationConstant.DEFAULT_MAIL_ID.getValue());
        email.setSubject("Subject");
        email.setTo("[email protected]");
        email.setCc("[email protected]");
        email.setText("Body of the email"); 
    }

    @Test
    public void sendEmailTest() throws Exception{      
        mimeMessageHelper.setSubject(email.getSubject());
        mimeMessageHelper.setFrom(new InternetAddress(email.getFrom(), true));
        mimeMessageHelper.setCc(new InternetAddress(email.getCc()[0], true));
        mimeMessageHelper.setTo(new InternetAddress(email.getTo()[0], true));
        mimeMessageHelper.setText(email.getText());
        expect(javaMailSender.createMimeMessage()).andReturn(mimeMessage);
        Address sendTo[]={new InternetAddress(email.getTo()[0])};
        mimeMessage.setRecipients(RecipientType.TO,sendTo);
        EasyMock.expectLastCall().times(1);
        EasyMock.replay(mimeMessage);
        EasyMock.replay(javaMailSender);
        EmailUtil.sendEmail(javaMailSender, email);
        EasyMock.verify(mimeMessage);
        EasyMock.verify(javaMailSender);
    }

}

错误信息：

java.lang.AssertionError:    Unexpected method call MimeMessage.setRecipients(To, [[email protected]]):
    MimeMessage.setRecipients(To, [[email protected]]): expected: 1, actual: 0    at org.easymock.internal.MockInvocationHandler.invoke(MockInvocationHandler.java:44)    at org.easymock.internal.ObjectMethodsFilter.invoke(ObjectMethodsFilter.java:94)    at org.easymock.internal.ClassProxyFactory$MockMethodInterceptor.intercept(ClassProxyFactory.java:97)   at $javax.mail.internet.MimeMessage$$EnhancerByCGLIB$$a6025b60.setRecipients(<generated>)   at org.springframework.mail.javamail.MimeMessageHelper.setTo(MimeMessageHelper.java:581)    at org.springframework.mail.javamail.MimeMessageHelper.setTo(MimeMessageHelper.java:595)    at com.dashboard.util.EmailUtil.sendEmail(EmailUtil.java:50)