LibTest/io/RandomAccessFile/writeFrom_A02_t01.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
/// Future<RandomAccessFile> writeFrom(
///     List<int> buffer, [
///     int start = 0,
///     int end
/// ])
/// Writes from a List<int> to the file.
/// . . .
/// Returns a Future<RandomAccessFile> that completes with this RandomAccessFile
/// when the write completes.
///
/// @description Checks that method writeFrom writes from a List<int> to the file
/// and returns Future<RandomAccessFile> that completes with this
/// RandomAccessFile when the write completes.
/// @author ngl@unipro.ru

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

void check(List<int> list) {
  int len = list.length;
  File file = getTempFileSync();
  asyncStart();
  Future<RandomAccessFile> raFile = file.open(mode: FileMode.write);
  raFile.then((RandomAccessFile rf) {
    Expect.equals(0, file.lengthSync());
    var f = rf.writeFrom(list);
    Expect.isTrue(f is Future<RandomAccessFile>);
    f.then((RandomAccessFile file) {
      Expect.isTrue(file is RandomAccessFile);
      Expect.equals(rf, file);
      Expect.equals(len, file.lengthSync());
      rf.setPositionSync(0);
      List<int> l = file.readSync(len);
      for (int i = 0; i < len; i++) {
        Expect.equals(i, l[i]);
      }
      asyncEnd();
    }).whenComplete(() {
      rf.closeSync();
      file.deleteSync();
    });
  });
}

main() {
  List<int> list = new List<int>(10);
  check([]);
  for (int i = 0; i < 10; i++) {
    list[i] = i;
    check(list.sublist(0, i + 1));
  }
}