Coroutine test with mockito.kotlin

CoroutineTest.kt

import kotlinx.coroutines.CoroutineName
import kotlinx.coroutines.runBlocking
import org.assertj.core.api.Assertions.assertThat
import org.junit.jupiter.api.Test
import org.mockito.kotlin.doSuspendableAnswer
import org.mockito.kotlin.mock
import kotlin.coroutines.coroutineContext

interface Subject {
  suspend fun myName(): String?
}

class SubjectImpl(private val obj: Subject) : Subject {
  override suspend fun myName(): String? = obj.myName()
}

class CoroutineTest {
  private val mock = mock<Subject> {
    onBlocking { myName() } doSuspendableAnswer  {
      coroutineContext[CoroutineName]?.name
    }
  }
  private val subj = SubjectImpl(mock)

  @Test
  fun check() {
    val name = "test-coroutine"
    val result = runBlocking(CoroutineName(name)) {
      subj.myName()
    }

    assertThat(result).isEqualTo(name)
  }
}