When writing tests in Kotlin, prefer Kotlin-specific testing libraries and language features over their Java equivalents. Use Mockito Kotlin instead of standard Mockito for more idiomatic syntax, and leverage Kotlin language features like `apply` blocks to make test setup code more concise and readable. For example, instead of: ```kotlin import org.mockito.Mockito.verify // ... val field = OkHttpClientProvider::class.java.getDeclaredField("sClient") field.isAccessible = true field.set(null, null) ``` Use: ```kotlin import org.mockito.kotlin.verify // ... val field = OkHttpClientProvider::class.java.getDeclaredField("sClient").apply { isAccessible = true set(null, null) } ``` This approach improves test code readability, reduces boilerplate, and takes advantage of Kotlin's expressive syntax to make tests more maintainable.