Add Testing

- [ ] http://erickt.github.io/blog/2015/09/22/if-you-use-unsafe/
- [x] https://github.com/Manishearth/rust-clippy

Start by reviewing the linked unsafe article and the rust-clippy repository, since these are the only investigation points in the issue. The issue does not name files, tests, or acceptance criteria, so the scope and definition of done need to be established before implementation.

由索引模型根据 Issue 内容生成。