LibTest/io/File/writeAsString_A03_t05.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 Future<File> writeAsString(
 *  String contents, {
 *  FileMode mode: FileMode.write,
 *  Encoding encoding: utf8,
 *  bool flush: false
 *  })
 * Write a string to a file.
 *
 * Opens the file, writes the string in the given encoding, and closes the file.
 * Returns a Future<File> that completes with this File object once the entire
 * operation has completed.
 *
 * By default writeAsString 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 argument flush is set to true, the data written will be flushed to the
 * file system before the returned future completes.
 * @description Checks that in a FileMode.read a FileSystemException is thrown.
 * Test not 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 = new File(getTempFilePath(parent: sandbox));
  asyncStart();
  await file.writeAsString("File content", mode: FileMode.read).then((f) {
    Expect.fail("FileSystemException is expected");
  }, onError: (e) {
    Expect.isTrue(e is FileSystemException);
    Expect.isFalse(file.existsSync());
    asyncEnd();
  });
}