Kotlin coroutine in Spring DataJpaTest - kotlin

Question

In a spring Boot service we have a new Kotlin coroutine implementation which works nicely.
However, when trying to test it the JpaRepository seems to get "truncated" when accessed on a coroutine block. here is a simplified portion of the code:
import kotlinx.coroutines.*
import org.junit.jupiter.api.Test
import org.junit.jupiter.api.extension.ExtendWith
import org.springframework.beans.factory.annotation.Autowired
import org.springframework.boot.test.autoconfigure.orm.jpa.DataJpaTest
import org.springframework.data.jpa.repository.JpaRepository
import org.springframework.test.context.ContextConfiguration
import org.springframework.test.context.junit.jupiter.SpringExtension
import javax.persistence.*
#ExtendWith(SpringExtension::class)
#ContextConfiguration(classes = [SpringTestConfig::class])
#DataJpaTest
class BadRepoTest(#Autowired val testedRepository: TestRepository) {
#Test
fun testRepo() {
testedRepository.saveAndFlush(TestEntity())
println("count at start: ${testedRepository.count()} and $testedRepository")
runBlocking {
runCodeAsync().await()
}
println("count post async code: ${testedRepository.count()} and $testedRepository")
}
fun runCodeAsync(): Deferred<Unit> {
return GlobalScope.async {
println("count in async code: ${testedRepository.count()} and $testedRepository")
}
}
}
interface TestRepository : JpaRepository<TestEntity, Int>
#Entity
#Table(name = "test")
data class TestEntity(
#Id #GeneratedValue(strategy = GenerationType.IDENTITY) val id: Int? = null
)
I would expect the repository to contain a single entity at all time during the test run, but the code prints:
count at the start: 1 and SimpleJpaRepository#40d04cf8
count in async code: 0 and SimpleJpaRepository#40d04cf8
count post async code: 1 and SimpleJpaRepository#40d04cf8
Could you please advise?