[Kotest] isolation modes

Single Instance

• 디폴트 isolation mode
• spec class는 한 번만 생성되고, 각 테스트를 실행.

class MyTests : WordSpec({
    val id = UUID.randomUUID()
    "a" should {
        println(id)
        "b" {
            println(id)
        }
        "c" {
            println(id)
        }
    }
})

e37fb8c6-6fbb-4e33-98f7-acf3c8d439bf
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e37fb8c6-6fbb-4e33-98f7-acf3c8d439bf

InstancePerTest

• 각 테스트 실행시마다 spec class를 생성

import io.kotest.core.spec.IsolationMode
import io.kotest.core.spec.style.WordSpec
import java.util.concurrent.atomic.AtomicInteger

class MyTests : WordSpec() {
    override fun isolationMode(): IsolationMode = IsolationMode.InstancePerTest

    private val counter = AtomicInteger(0)

    init {
        "a" should {
            println("a=" + counter.getAndIncrement())
            "b" {
                println("b=" + counter.getAndIncrement())
            }
            "c" {
                println("c=" + counter.getAndIncrement())
            }
        }
    }
}

a=0
a=0
b=1
a=0
c=1

InstancePerLeaf

• InstancePerTest와 동일
• InstancePerTest는 context 내부까지 실행한다면, InstancePerLeaf는 context 내부는 실행하지 않음

import io.kotest.core.spec.IsolationMode
import io.kotest.core.spec.style.WordSpec
import java.util.concurrent.atomic.AtomicInteger

class MyTests : WordSpec() {
    override fun isolationMode(): IsolationMode = IsolationMode.InstancePerLeaf

    private val counter = AtomicInteger(0)

    init {
        "a" should {
            println("a=" + counter.getAndIncrement())
            "b" {
                println("b=" + counter.getAndIncrement())
            }
            "c" {
                println("c=" + counter.getAndIncrement())
            }
        }
    }
}

a=0
b=1
a=0
c=1