Expose Zones.

tests/lib/async/catch_errors2_test.dart

Index: tests/lib/async/catch_errors2_test.dart
diff --git a/tests/lib/async/catch_errors2_test.dart b/tests/lib/async/catch_errors2_test.dart
index 4c0d77c88de50e33022bc5b37bc65bbc42bed39b..bdc0c32d03301f97271be4848983b3c90a6934cd 100644
--- a/tests/lib/async/catch_errors2_test.dart
+++ b/tests/lib/async/catch_errors2_test.dart
@@ -10,10 +10,11 @@ import 'catch_errors.dart';
 main() {
   asyncStart();
   bool futureWasExecuted = false;
-  // Make sure that `catchErrors` only closes the error stream when the inner
-  // futures are done.
+  Future done;
+
+  // Error streams never close.
   catchErrors(() {
-    new Future(() {
+    done = new Future(() {
       futureWasExecuted = true;
     });
     return 'allDone';
@@ -21,7 +22,8 @@ main() {
       Expect.fail("Unexpected callback");
     },
     onDone: () {
-      Expect.isTrue(futureWasExecuted);
-      asyncEnd();
+      Expect.fail("Unexpected callback");
     });
+
+  done.whenComplete(asyncEnd);
 }