Mock With Kotlin git : https://github.com/mockk/mockk Getting Started https://blog.naver.com/gngh0101/222545336054 Mocking is not rocket science: Basics https://blog.kotlin-academy.com/mocking-is-not-rocket-science-basics-ae55d0aadf2b Internal https://sukyology.medium.com/mockk%EC%9D%98-%ED%9D%91%EB%A7%88%EC%88%A0%EC%9D%84-%ED%8C%8C%ED%97%A4%EC%B9%98%EC%9E%90-6fe907129c19 Extension functions mockkStatic 사용해야 한다. https://mockk.io/#extension-functions