LibTest/io/File/writeAsStringSync_A03_t08.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.

// @dart = 2.9

/// @assertion void writeAsStringSync(
///  String contents, {
///  FileMode mode: FileMode.write,
///  Encoding encoding: utf8,
///  bool flush: false
///  })
/// Synchronously write a string to a file.
///
/// Opens the file, writes the string in the given encoding, and closes the file.
///
/// By default writeAsStringSync 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.write writeAsString creates the
/// file for writing and truncates the file if it already exists
/// @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("Old content");
  file.writeAsStringSync("New content", mode: FileMode.write);
  Expect.equals("New content", file.readAsStringSync());
}