Add both sync and async methods for getting streams for a File

tests/standalone/src/FileOutputStreamTest.dart

+// Copyright (c) 2012, 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.
+// Testing file input stream, VM-only, standalone test.
+
+#import("dart:io");
+
+void testOpenOutputStreamSync() {
+  Directory tempDirectory = new Directory('');
+
+  // Create a port for waiting on the final result of this test.
+  ReceivePort done = new ReceivePort();
+  done.receive((message, replyTo) {
+    tempDirectory.deleteSync();
+    done.close();
+  });
+
+  tempDirectory.createTempSync();
+  String fileName = "${tempDirectory.path}/test";
+  File file = new File(fileName);
+  file.createSync();
+  OutputStream x = file.openOutputStreamSync();
+  x.write([65, 66, 67]);
+  x.close();
+  x.closeHandler = () {
+    file.deleteSync();
+    done.toSendPort().send("done");
+  };
+}
+
+
+void testOpenOutputStreamAsync() {
+  Directory tempDirectory = new Directory('');
+
+  // Create a port for waiting on the final result of this test.
+  ReceivePort done = new ReceivePort();
+  done.receive((message, replyTo) {
+    tempDirectory.delete();
+    tempDirectory.deleteHandler = () {
+      done.close();
+    };
+  });
+
+  tempDirectory.createTemp();
+  tempDirectory.createTempHandler = () {
+    String fileName = "${tempDirectory.path}/test";
+    File file = new File(fileName);
+    file.create();
+    file.createHandler = () {
+      file.openOutputStream();
+      file.outputStreamHandler = (OutputStream stream) {
+        stream.close();
+        stream.closeHandler = () {
+          file.delete();
+        };
+      };
+    };
+    file.deleteHandler = () {
+      done.toSendPort().send("done");
+    };
+  };
+}
+
+
+void testOutputStreamNoPendingWrite() {
+  Directory tempDirectory = new Directory('');
+
+  // Create a port for waiting on the final result of this test.
+  ReceivePort done = new ReceivePort();
+  done.receive((message, replyTo) {
+    tempDirectory.delete();
+    tempDirectory.deleteHandler = () {
+      done.close();
+    };
+  });
+
+  tempDirectory.createTemp();
+  tempDirectory.createTempHandler = () {
+    String fileName = "${tempDirectory.path}/test";
+    File file = new File(fileName);
+    file.create();
+    file.createHandler = () {
+      file.openOutputStream();
+      file.outputStreamHandler = (OutputStream stream) {
+        final total = 100;
+        var count = 0;
+        stream.noPendingWriteHandler = () {
+          stream.write([count++]);
+          if (count == total) {
+            stream.close();
+          }
+        };
+        stream.closeHandler = () {
+          List buffer = new List<int>(total);
+          File fileSync = new File(fileName);
+          var openedFile = fileSync.openSync();
+          openedFile.readListSync(buffer, 0, total);
+          for (var i = 0; i < total; i++) {
+            Expect.equals(i, buffer[i]);
+          }
+          openedFile.closeSync();
+          fileSync.deleteSync();
+          done.toSendPort().send("done");
+        };
+      };
+    };
+  };
+}
+
+
+main() {
+  testOpenOutputStreamSync();
+  testOpenOutputStreamAsync();
+  testOutputStreamNoPendingWrite();
+}