Migrating Groovy to Kotlin: afterTest

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For the same reason you should not use tasks.withType(Test) { ... } in Groovy, you shouldn’t use tasks.withType<Test>() { ... } in Kotlin (destroying task configuration avoidance for all test tasks).

That those methods do only have a Closure variant is surely a shortcoming you could request get fixed with a feature request.

But in the meantime, you can use KotlinClosure2 like:

tasks.withType<Test>().configureEach {
    afterTest(KotlinClosure2<TestDescriptor, TestResult, Unit>({ _, result ->
        if (result.resultType == TestResult.ResultType.SKIPPED) {
            throw GradleException("Do not ignore test cases")
        }
    }))
}
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