### What problem does this PR solve?
Add license statement.
### Type of change
- [x] Refactoring
Signed-off-by: Jin Hai <haijin.chn@gmail.com>
Add tests for frontend API (#3552)
liuhua+1: liuhua
8faf53b
### What problem does this PR solve?
Add tests for frontend API
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
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Co-authored-by: liuhua <10215101452@stu.ecun.edu.cn>
