Don't break the chain

DontBreakTheChainTest.kt

package com.capitalone.android.coroutines

import kotlinx.coroutines.CoroutineDispatcher
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.launch
import kotlinx.coroutines.plus
import kotlinx.coroutines.runBlocking
import org.junit.Test
import kotlin.coroutines.ContinuationInterceptor

class DontBreakTheChainTest {
    @Test
    fun this_test_passes_when_an_exception_is_thrown() = runBlocking<Unit> {
        val parentScope = this
        val parentDispatcher = parentScope.coroutineContext[ContinuationInterceptor]!! as CoroutineDispatcher
        // break structured concurrency
        val newScope = CoroutineScope(parentDispatcher)
        newScope.launch {
            throw Exception("fail")
        }
            .join()
    }

    @Test
    fun this_test_fails_when_an_exception_is_thrown() = runBlocking<Unit> {
        val parentScope = this
        // keep structured concurrency alive
        val newScope = parentScope + Dispatchers.Unconfined
        newScope.launch {
            throw Exception("fail")
        }
            .join()
    }
}