### What problem does this PR solve?
Add test for document
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
Co-authored-by: liuhua <10215101452@stu.ecun.edu.cn>
### What problem does this PR solve?
_Briefly describe what this PR aims to solve. Include background context
that will help reviewers understand the purpose of the PR._
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
---------
Co-authored-by: Kevin Hu <kevinhu.sh@gmail.com>
### What problem does this PR solve?
Make the document start parsing.
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
### What problem does this PR solve?
API: Adds the feature of uploading document.
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
