LibTest/io/File/openWrite_A01_t03.dart

// Copyright (c) 2017, 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.

/// @assertion IOSink openWrite({
/// FileMode mode: FileMode.write,
/// Encoding encoding: utf8
/// })
/// Creates a new independent IOSink for the file. The IOSink must be closed when
/// no longer used, to free system resources.
///
/// An IOSink for a file can be opened in two modes:
///
/// FileMode.write: truncates the file to length zero.
/// FileMode.append: sets the initial write position to the end of the file.
/// When writing strings through the returned IOSink the encoding specified using
/// encoding will be used. The returned IOSink has an encoding property which can
/// be changed after the IOSink has been created.
/// @description Checks that this method creates a new independent IOSink for the
/// file. Test WRITE_ONLY mode
/// @author sgrekhov@unipro.ru

import "dart:io";
import "../../../Utils/expect.dart";
import "../file_utils.dart";

main() async {
  await inSandbox(_main);
}

_main(Directory sandbox) async {
  File file = getTempFileSync(parent: sandbox);
  file.writeAsStringSync("UTF-8: кириллица ");
  IOSink sink = file.openWrite(mode: FileMode.writeOnly);
  sink.write("прекрасна");
  asyncStart();
  await sink.close().then((_) {
    Expect.equals("прекрасна", file.readAsStringSync());
    asyncEnd();
  });
}