blob: 6d9428bdecc33078a1022160a56f646e1bee85f9 [file] [log] [blame]
// 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<RandomAccessFile> truncate(int length)
/// Truncates (or extends) the file to length bytes. Returns a
/// Future<RandomAccessFile> that completes with this RandomAccessFile when the
/// truncation has been performed.
///
/// @description Checks that method truncate returns a Future<RandomAccessFile>
/// that completes with this RandomAccessFile when the truncation has been
/// performed.
/// @author ngl@unipro.ru
import "dart:async";
import "dart:io";
import "../../../Utils/expect.dart";
import "../file_utils.dart";
main() {
File file = getTempFileSync();
asyncStart();
Future<RandomAccessFile> raFile = file.open(mode: FileMode.write);
raFile.then((RandomAccessFile rf) {
Expect.isNotNull(rf);
for (int i = 0; i < 10; i++) {
rf.writeByteSync((i + 1) & 0xff);
}
var f1 = rf.truncate(10);
Expect.isTrue(f1 is Future<RandomAccessFile>);
Expect.runtimeIsType<Future<RandomAccessFile>>(f1);
f1.then((RandomAccessFile f) {
Expect.equals(f, rf);
asyncEnd();
}).whenComplete(() {
rf.closeSync();
file.deleteSync();
});
});
}