Support Dart 1.8.0.

test/vm_listener_test.dart

 // Copyright (c) 2015, 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 'dart:async';
 import 'dart:isolate';
 
 import 'package:unittest/src/invoker.dart';
+import 'package:unittest/src/io.dart';
 import 'package:unittest/src/isolate_test.dart';
 import 'package:unittest/src/live_test.dart';
 import 'package:unittest/src/remote_exception.dart';
 import 'package:unittest/src/state.dart';
 import 'package:unittest/src/suite.dart';
 import 'package:unittest/src/vm_listener.dart';
 import 'package:unittest/unittest.dart';
 
 import 'utils.dart';
 
 /// An isolate that's been spun up for the current test.
 ///
 /// This is tracked so that it can be killed once the test is done.
 Isolate _isolate;
 
 /// A live test that's running for the current test.
 ///
 /// This is tracked so that it can be closed once the test is done.
 LiveTest _liveTest;
 
 void main() {
   tearDown(() {
-    if (_isolate != null) _isolate.kill(Isolate.IMMEDIATE);
+    if (_isolate != null && supportsIsolateKill) {
+      _isolate.kill(Isolate.IMMEDIATE);
+    }
     _isolate = null;
 
     if (_liveTest != null) _liveTest.close();
     _liveTest = null;
   });
 
   test("sends a list of available tests on startup", () {
     return _spawnIsolate(_successfulTests).then((receivePort) {
       return receivePort.first;
     }).then((response) {
@@ skipping 324 matching lines @@
   VmListener.start(sendPort, () => () {
     test("multiple errors", () {
       Invoker.current.addOutstandingCallback();
       new Future(() => throw "one");
       new Future(() => throw "two");
       new Future(() => throw "three");
       new Future(() => throw "four");
     });
   });
 }