Expose Zones.

tests/lib/async/catch_errors27_test.dart

Index: tests/lib/async/catch_errors27_test.dart
diff --git a/tests/lib/async/catch_errors27_test.dart b/tests/lib/async/catch_errors27_test.dart
index 23f8b9975bf68043357c62872d7c3ebdacff0c2a..ab89f16b113a7937e7797f24d1ecff0a0f3ec1ad 100644
--- a/tests/lib/async/catch_errors27_test.dart
+++ b/tests/lib/async/catch_errors27_test.dart
@@ -9,6 +9,8 @@ import 'catch_errors.dart';
 
 main() {
   asyncStart();
+  Completer done = new Completer();
+
   var events = [];
   StreamController controller;
   Stream stream;
@@ -37,19 +39,26 @@ main() {
         controller.addError(2);
         controller.close();
       });
-    }).listen((x) { events.add(x); })
-      .asFuture().then((_) { events.add("inner done"); });
+    }).listen((x) {
+                events.add(x);
+                if (x == 2) done.complete(true);
+              })
+      .asFuture().then((_) { Expect.fail("Unexpected callback"); });
     stream.listen((x) { events.add("stream2 $x"); });
   }).listen((x) { events.add("outer: $x"); },
-            onDone: () {
-              Expect.listEquals(["map 1",
-                                 "stream 101",
-                                 "stream2 101",
-                                 "stream error 2",
-                                 2, // Caught by the inner `catchErrors`.
-                                 "inner done",
-                                ],
-                                events);
-              asyncEnd();
-            });
+            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 2",
+                          2, // Caught by the inner `catchErrors`.
+                        ],
+                        events);
+      asyncEnd();
+    });
+  });
 }