[LAB1] 312552024

[cherry900606]

Description

1. Add test in main_test.js
2. Achieve 100% code coverage

(Note: 上一次的 pull request 因操作錯誤 coverage 沒到 100% 故重新上傳)

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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

[TaiYou-TW]

You don't need to close the old one and open a new one. The updated code will appear here when you push your code to your repo.