Fix spurious failures in TaskTest (Kotlin#2996)

Author: qwwdfsad

integration/kotlinx-coroutines-play-services/test/FakeAndroid.kt

@@ -2,10 +2,17 @@ package android.os
 
 import kotlinx.coroutines.GlobalScope
 import kotlinx.coroutines.launch
+import java.util.concurrent.*
 
 class Handler(val looper: Looper) {
     fun post(r: Runnable): Boolean {
-        GlobalScope.launch { r.run() }
+        try {
+            GlobalScope.launch { r.run() }
+        } catch (e: RejectedExecutionException) {
+            // Execute leftover callbacks in place for tests
+            r.run()
+        }
+
         return true
     }
 }

kotlinx-coroutines-core/jvm/src/DefaultExecutor.kt

@@ -42,7 +42,7 @@ internal actual object DefaultExecutor : EventLoopImplBase(), Runnable {
     @Volatile
     private var debugStatus: Int = FRESH
 
-    val isShutDown: Boolean get() = debugStatus == SHUTDOWN
+    private val isShutDown: Boolean get() = debugStatus == SHUTDOWN
 
     private val isShutdownRequested: Boolean get() {
         val debugStatus = debugStatus

kotlinx-coroutines-core/jvm/test/TestBase.kt

@@ -152,7 +152,8 @@ public actual open class TestBase(private var disableOutCheck: Boolean)  {
     })
 
     fun println(message: Any?) {
-        previousOut.println(message)
+        if (disableOutCheck) kotlin.io.println(message)
+        else previousOut.println(message)
     }
 
     @Before