Migrate async tests to strong

tests/lib_strong/async/catch_errors23_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:async_helper/async_helper.dart';
+import "package:expect/expect.dart";
+import 'dart:async';
+import 'catch_errors.dart';
+
+main() {
+  asyncStart();
+  Completer done = new Completer();
+
+  var events = [];
+  StreamController controller;
+  Stream stream;
+  // Test that errors are not traversing zone boundaries.
+  // Note that the first listener of `asBroadcastStream` determines in which
+  // zone the subscription lives.
+  catchErrors(() {
+    catchErrors(() {
+      controller = new StreamController();
+
+      // Assign to "global" `stream`.
+      stream = controller.stream
+        .map((x) {
+          events.add("map $x");
+          return x + 100;
+        })
+        .transform(new StreamTransformer.fromHandlers(
+            handleError: (e, st, sink) { sink.add("error $e"); }))
+        .asBroadcastStream();
+
+      // Listen to `stream` in the inner zone.
+      stream.listen((x) { events.add("stream $x"); });
+    }).listen((x) { events.add(x); })
+      .asFuture().then((_) { Expect.fail("Unexpected callback"); });
+
+    // Listen to `stream` in the outer zone.
+    stream.listen((x) { events.add("stream2 $x"); });
+
+    // Feed the controller from the outer zone.
+    controller.add(1);
+    // `addError` does not count as zone-traversal. It should be caught by
+    // the inner error handler.
+    controller.addError("inner error");
+    new Future.error("caught by outer");
+    controller.close();
+  }).listen((x) {
+                  events.add("outer: $x");
+                  if (x == "caught by outer") done.complete(true);
+                },
+            onDone: () { Expect.fail("Unexpected callback"); });
+
+  done.future.whenComplete(() {
+    // Give handlers time to run.
+    Timer.run(() {
+      Expect.listEquals(["map 1",
+                         "stream 101",
+                         "stream2 101",
+                         "stream error inner error",
+                         "stream2 error inner error",
+                         "outer: caught by outer",
+                        ],
+                        events);
+      asyncEnd();
+    });
+  });
+}