Add an OutputStream.closed getter.

tests/standalone/io/list_output_stream_test.dart

Index: tests/standalone/io/list_output_stream_test.dart
diff --git a/tests/standalone/io/list_output_stream_test.dart b/tests/standalone/io/list_output_stream_test.dart
index 812c4b3d3a3844b07e00347c682df4150abe2d19..748008bcfaac3690fca6c1c779c05d842b5761b0 100644
--- a/tests/standalone/io/list_output_stream_test.dart
+++ b/tests/standalone/io/list_output_stream_test.dart
@@ -139,6 +139,25 @@ void testListOutputStream4() {
   donePort.receive((x,y) => donePort.close());
 }
 
+void testListOutputStream5() {
+  ListOutputStream stream = new ListOutputStream();
+  ReceivePort donePort = new ReceivePort();
+  List result = <int>[];
+
+  stream.onClosed = () {
+    Expect.isTrue(stream.closed);

[Bill Hesse, 2012/08/08 14:21:11]

Why not check the contents here?

[nweiz, 2012/08/09 19:39:52]

Done.

+    donePort.toSendPort().send(null);
+  };
+
+  Expect.isFalse(stream.closed);
+  stream.write([1, 2, 3]);
+  Expect.isFalse(stream.closed);
+  stream.close();
+  Expect.isTrue(stream.closed);
+

[Bill Hesse, 2012/08/08 14:21:11]

Add a test that .write throws an exception here?

[nweiz, 2012/08/09 19:39:52]

Done.

+  donePort.receive((x,y) => donePort.close());
+}
+
 main() {
   testEmptyListOutputStream1();
   testEmptyListOutputStream2();
@@ -146,4 +165,5 @@ main() {
   testListOutputStream2();
   testListOutputStream3();
   testListOutputStream4();
+  testListOutputStream5();
 }