test: amountToHangul 테스트 추가

[fe-dudu]

Overview

amountToHangul 함수의 테스트 코드를 추가하여 Uncovered Line을 제거합니다.

PR Checklist

• I read and included theses actions below

1. I have read the Contributing Guide
2. I have written documents and tests, if needed.

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Name	Status	Preview	Comments	Updated (UTC)
es-hangul	❌ Failed (Inspect)			Jun 25, 2024 0:08am