blob: f7dac3200f2aa6443f121c5b226b2b80c288a790 [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.
// @dart = 2.9
/// @assertion Future<int> readByte()
/// Reads a byte from the file. Returns a Future<int> that completes with the
/// byte, or with -1 if end-of-file has been reached.
///
/// @description Checks that method readByte returns Future<int> that completes
/// with -1 if end-of-file has been reached.
/// @author ngl@unipro.ru
import "dart:async";
import "dart:io";
import "../../../Utils/expect.dart";
import "../file_utils.dart";
main(m) {
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 byte = rf.readByte();
Expect.isTrue(byte is Future<int>);
byte.then((int b) {
Expect.isTrue(b is int);
Expect.equals(-1, b);
asyncEnd();
}).whenComplete(() {
rf.closeSync();
file.deleteSync();
});
});
}