Unit Tests

[FerdinandSu]

Hi, I'm the developer of this Program, but I don't have enough time to make my program perfect. I'll appreciate it if you can help me improve it and become a contributor. Here is an existing issue:

This Project lacks Unit Tests, please help me write some.
本项目需要补充一些单元测试，补充一些即可。

Not all existing tests are passing, for now, debugging them can also make a PR. Remember to attach the coverage report whenever raising a Test-related PR!
不是所有现存测试都能通过，对他们进行调试也适合作为PR。请记得在PR中附上测试的覆盖率报告。

[FerdinandSu]

Please don't hesitate to ask me questions; also, leave comments before you start your work to avoid duplicated work.

如果你有任何疑问，欢迎留言询问我；请在开始前在此留言，防止他人进行重复的工作。