[LAB1] 312551008

[CTHua]

Description

add test into main_test.js

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• A clear title (name your pr "[LAB{lab_number}] {your_student_id}")
• A meaningful message for PR, as well as its commits
• From your specific branch (not main or other's branch) merging to your branch
• Excluding any irrelevant files, such as binaries, text files, or dot files
• Passing tests/CI
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