blob: fc0ae2df2862468d9923dc2e74110d83c3b95f95 [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> open({FileMode mode: FileMode.read})
/// Open the file for random access operations. Returns a
/// Future<RandomAccessFile> that completes with the opened random access file.
/// RandomAccessFiles must be closed using the RandomAccessFile.close method.
///
/// Files can be opened in three modes:
/// FileMode.read: open the file for reading.
/// FileMode.write: open the file for both reading and writing and truncate the
/// file to length zero. If the file does not exist the file is created.
///
/// FileMode.append: same as FileMode.write except that the file is not
/// truncated.
/// @description Checks that this method returns a Future<RandomAccessFile> that
/// completes with the opened random access file. Test WRITE_ONLY_APPEND mode
/// @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([0, 1, 2, 3, 4]);
asyncStart();
await file.open(mode: FileMode.writeOnlyAppend).then((RandomAccessFile raFile) {
try {
Expect.equals(5, raFile.lengthSync());
raFile.setPositionSync(1);
raFile.writeByteSync(0);
raFile.setPositionSync(0);
Expect.throws(() {raFile.readByteSync();},
(e) => e is FileSystemException);
asyncEnd();
} finally {
raFile.closeSync();
}
});
}