LibTest/io/File/writeAsBytesSync_A02_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 void writeAsBytesSync(
/// List<int> bytes, {
/// FileMode mode: FileMode.write,
/// bool flush: false
/// })
/// Synchronously write a list of bytes to a file.
///
/// Opens the file, writes the list of bytes to it and closes the file.
///
/// By default writeAsBytesSync creates the file for writing and truncates the
/// file if it already exists. In order to append the bytes to an existing file,
/// pass FileMode.append as the optional mode parameter.
///
/// If the flush argument is set to true data written will be flushed to the file
/// system before returning.
///
/// Throws a FileSystemException if the operation fails.
/// @description Checks that in a FileMode.append bytes are appended to an
/// existing file
/// @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.writeAsBytesSync([1, 1, 1, 1, 1]);
  file.writeAsBytesSync([3, 1, 4, 1, 5], mode: FileMode.append);
  Expect.isTrue(file.existsSync());
  Expect.listEquals([1, 1, 1, 1, 1, 3, 1, 4, 1, 5], file.readAsBytesSync());
}