Fix tests not being run with the right dispatcher

Integration with BlockHound revealed that several tests were
performing blocking operations such as Thread.sleep in
coroutine context `Dispatchers.DEFAULT`.

Also, some tests hanged because the exception that notified about
blocking calls were wildcard-matched.

kotlinx-coroutines-debug/test/CoroutinesDumpTest.kt

@@ -39,7 +39,7 @@ class CoroutinesDumpTest : DebugTestBase() {
 
  @Test
  fun testRunningCoroutine() = runBlocking {
- val deferred = async(Dispatchers.Default) {
+ val deferred = async(Dispatchers.IO) {
  activeMethod(shouldSuspend = false)
  assertTrue(true)
  }
@@ -70,7 +70,7 @@ class CoroutinesDumpTest : DebugTestBase() {
 
  @Test
  fun testRunningCoroutineWithSuspensionPoint() = runBlocking {
- val deferred = async(Dispatchers.Default) {
+ val deferred = async(Dispatchers.IO) {
  activeMethod(shouldSuspend = true)
  yield() // tail-call
  }
@@ -100,7 +100,7 @@ class CoroutinesDumpTest : DebugTestBase() {
 
  @Test
  fun testCreationStackTrace() = runBlocking {
- val deferred = async(Dispatchers.Default) {
+ val deferred = async(Dispatchers.IO) {
  activeMethod(shouldSuspend = true)
  }
 
@@ -129,7 +129,7 @@ class CoroutinesDumpTest : DebugTestBase() {
 
  @Test
  fun testFinishedCoroutineRemoved() = runBlocking {
- val deferred = async(Dispatchers.Default) {
+ val deferred = async(Dispatchers.IO) {
  activeMethod(shouldSuspend = true)
  }
 
@@ -149,7 +149,10 @@ class CoroutinesDumpTest : DebugTestBase() {
  if (shouldSuspend) yield()
  notifyCoroutineStarted()
  while (coroutineContext[Job]!!.isActive) {
- runCatching { Thread.sleep(60_000) }
+ try {
+ Thread.sleep(60_000)
+ } catch (_ : InterruptedException) {
+ }
  }
  }
 

kotlinx-coroutines-debug/test/RunningThreadStackMergeTest.kt

@@ -133,7 +133,7 @@ class RunningThreadStackMergeTest : DebugTestBase() {
  }
 
  private fun CoroutineScope.launchEscapingCoroutineWithoutContext() {
- launch(Dispatchers.Default) {
+ launch(Dispatchers.IO) {
  suspendingFunctionWithoutContext()
  assertTrue(true)
  }