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increase rm-datasource module test coverage

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Hey guys

I am learning and using seata recently, this is a great thing.

Component
spring-cloud-alibaba-seata:0.9.0.RELEASE

Question
I see that the seata source code contains the spring boot web dependency. **Is there a plan to support [sp

文档怎么撰写对于使用者至关重要，所以每个人可以在这里提出自己的意见和建议。对用户文档的目录做一个基本的草稿，可以讨论，然后分成各个issue，大家一起撰写文档

在线文档地址： http://seata.io/zh-cn/docs/overview/what-is-seata.html
中文文档编写规范参考： https://github.com/ruanyf/document-style-guide
项目地址：
注意： 本次优先编写中文版本文档，鼓励同时提交英文版本。
目录如下：

• 用户文档
  • 认识分布式事务
    • 概念
    • 理论依据、论文
  • Seata 是什么
  • FAQ
  • 事务模式