What is proper workaround for @BeforeAll in Kotlin

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JUnit 5 has @TestInstance(PER_CLASS) annotation that can be used for this purpose. One of the features that it enables is non-static BeforeAll and AfterAll methods:

@TestInstance(PER_CLASS)
class BeforeAllTests {

    lateinit var isInit = false

    @BeforeAll
    fun setup() {
        isInit = true
    }

   @TestFactory
   fun beforeAll() = listOf(
       should("initialize isInit in BeforeAll") {
           assertTrue(isInit)
       }
   )
}

fun should(name: String, test: () -> Unit) = DynamicTest.dynamicTest("should $name", test)

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