Let completers complete in the zone they were constructed in.

tests/standalone/io/async_catch_errors_test.dart

+// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import "package:expect/expect.dart";
+import 'dart:async';
+import 'dart:isolate';
+import 'dart:io';
+
+Stream catchErrors(void body()) {

[Anders Johnsen, 2013/07/05 17:10:50]

This is not used.

[floitsch, 2013/07/08 10:45:51]

Done.

+  StreamController controller;
+
+  bool onError(e) {
+    controller.add(e);
+    return true;
+  }
+
+  void onDone() {
+    controller.close();
+  }
+
+  void onListen() {
+    runZonedExperimental(body, onError: onError, onDone: onDone);
+  }
+
+  controller = new StreamController(onListen: onListen);
+  return controller.stream;
+}
+
+var timeOutPort;
+
+void startTests() {
+  // We keep a ReceivePort open until all tests are done. This way the VM will
+  // hang if the callbacks are not invoked and the test will time out.
+  timeOutPort = new ReceivePort();
+}
+
+void finishTests() {
+  Expect.listEquals(["SocketException",
+                     "FileException"],
+                    events);
+  timeOutPort.close();
+}
+
+void launchNextTest() {
+  if (tests.isEmpty) {
+    finishTests();
+    return;
+  }
+  var test = tests.last;

[Anders Johnsen, 2013/07/05 17:10:50]

Heh, this looks a lot like what an iterator can ;)

[floitsch, 2013/07/08 10:45:51]

Done.

+  tests.length--;
+  test();
+}
+
+void testSocketException() {
+   runZonedExperimental(() {
+    Socket.connect("4", 1).then((Socket s) {
+       Expect.fail("Socket should not be able to connect");
+     });
+   }, onError: (err) {

[Anders Johnsen, 2013/07/05 17:10:50]

Add a counter, to test for max 1.

[floitsch, 2013/07/08 10:45:51]

Done.

+     if (err is! SocketException) Expect.fail("Not expected error: $err");
+     events.add("SocketException");

[Anders Johnsen, 2013/07/05 17:10:50]

How is events in scope here?

[Lasse Reichstein Nielsen, 2013/07/05 19:00:07]

Declared at top-level in the code below.

+     launchNextTest();
+   });
+}
+
+void testFileException() {
+   runZonedExperimental(() {
+     new File("lol it's not a file\n").openRead().listen(null);
+   }, onError: (err) {

[Anders Johnsen, 2013/07/05 17:10:50]

Ditto as above.

[floitsch, 2013/07/08 10:45:51]

Done.

+     if (err is! FileException) Expect.fail("Not expected error: $err");
+     events.add("FileException");
+     launchNextTest();
+   });
+}
+
+var events = [];
+// In reverse order:
+var tests = [testFileException, testSocketException];
+
+
+main() {
+  startTests();
+  launchNextTest();
+}