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Testing Email Service Implementation in spring-boot-examples

This test suite validates email functionality in a Spring Boot application, covering various types of email sending capabilities including simple text, HTML, attachments, inline resources, and template-based emails. The tests ensure robust email service implementation using Spring’s mail features and Thymeleaf templating.

Test Coverage Overview

The test suite provides comprehensive coverage of email sending functionality:

Simple text email verification
HTML-formatted email testing
Attachment handling validation
Inline resource (images) email testing
Template-based email generation using Thymeleaf

Implementation Analysis

The testing approach utilizes Spring Boot’s testing framework with JUnit4 integration. The implementation leverages @RunWith(SpringRunner.class) and @SpringBootTest annotations for proper Spring context loading. Tests are organized around the MailService component, with dependency injection of required services including TemplateEngine for template processing.

Technical Details

Testing tools and configuration:

JUnit 4 testing framework
Spring Boot Test context
Spring Runner for test execution
Thymeleaf TemplateEngine for email templates
Autowired dependency injection for services

Best Practices Demonstrated

The test suite exemplifies several testing best practices:

Isolated test methods for each email type
Clear test method naming conventions
Proper exception handling with throws clause
Comprehensive coverage of different email scenarios
Integration with Spring Boot’s testing infrastructure

ityouknow/spring-boot-examples

2.x/spring-boot-mail/src/test/java/com/neo/service/MailServiceTest.java

            
package com.neo.service;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import org.thymeleaf.TemplateEngine;
import org.thymeleaf.context.Context;

/**
 * Created by summer on 2017/5/4.
 */
@RunWith(SpringRunner.class)
@SpringBootTest
public class MailServiceTest {

    @Autowired
    private MailService mailService;

    @Autowired
    private TemplateEngine templateEngine;

    @Test
    public void testSimpleMail() throws Exception {
        mailService.sendSimpleMail("[email protected]","test simple mail"," hello this is simple mail");
    }

    @Test
    public void testHtmlMail() throws Exception {
        String content="<html>\n" +
                "<body>\n" +
                "    <h3>hello world ! 这是一封html邮件!</h3>\n" +
                "</body>\n" +
                "</html>";
        mailService.sendHtmlMail("[email protected]","test simple mail",content);
    }

    @Test
    public void sendAttachmentsMail() {
        String filePath="e:\\tmp\\application.log";
        mailService.sendAttachmentsMail("[email protected]", "主题：带附件的邮件", "有附件，请查收！", filePath);
    }


    @Test
    public void sendInlineResourceMail() {
        String rscId = "neo006";
        String content="<html><body>这是有图片的邮件：<img src=\'cid:" + rscId + "\' ></body></html>";
        String imgPath = "C:\\Users\\summer\\Pictures\\favicon.png";

        mailService.sendInlineResourceMail("[email protected]", "主题：这是有图片的邮件", content, imgPath, rscId);
    }


    @Test
    public void sendTemplateMail() {
        //创建邮件正文
        Context context = new Context();
        context.setVariable("id", "006");
        String emailContent = templateEngine.process("emailTemplate", context);

        mailService.sendHtmlMail("[email protected]","主题：这是模板邮件",emailContent);
    }
}