|  | // 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 "dart:isolate"; | 
|  |  | 
|  | import "package:expect/expect.dart"; | 
|  |  | 
|  | void test(port) { | 
|  | Expect.isFalse(const bool.fromEnvironment('NOT_FOUND')); | 
|  | Expect.isTrue(const bool.fromEnvironment('NOT_FOUND', defaultValue: true)); | 
|  | Expect.isFalse(const bool.fromEnvironment('NOT_FOUND', defaultValue: false)); | 
|  | Expect.isNull(const bool.fromEnvironment('NOT_FOUND', defaultValue: null)); | 
|  | if (port != null) port.send(null); | 
|  | } | 
|  |  | 
|  | main() { | 
|  | test(null); | 
|  | var port = new ReceivePort(); | 
|  | Isolate.spawn(test, port.sendPort); | 
|  | port.listen((_) => port.close()); | 
|  | } |