LibTest/io/IOSink/flush_A01_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 flush()
/// Returns a [Future] that completes once all buffered data is accepted by the
/// underlying [StreamConsumer].
/// @description Checks that data is flushed after the [flush] call.
/// @author iarkh@unipro.ru

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

int flushed = 0;
int cnt = 0;

class MyStreamConsumer extends StreamConsumer<List<int>> {
  Future addStream(Stream<List<int>> stream) {
    return new Future(() {}).then((x) { cnt++; } );
  }
  Future close() { return new Future(() {}); }
}

test() async {
  Stream<List<int>> stream1 = new Stream<List<int>>.fromIterable([[1, 2]]);
  Stream<List<int>> stream2 = new Stream<List<int>>.fromIterable([[12], [3, 22]]);
  Stream<List<int>> stream3 = new Stream<List<int>>.fromIterable([[3, 22]]);
  Stream<List<int>> stream4 = new Stream<List<int>>.fromIterable([[1, 1, 2, 1], [12]]);
  Stream<List<int>> stream5 = new Stream<List<int>>.fromIterable([[1, 2]]);

  StreamConsumer consumer = new MyStreamConsumer();

  IOSink sink = new IOSink(consumer);

  await sink.addStream(stream1).then((x) { cnt++; });
  sink.add([0]);
  await sink.addStream(stream2).then((x) { cnt++; });
  sink.write(12);
  await sink.addStream(stream3).then((x) { cnt++; });
  sink.writeln("This is a test");
  sink.writeAll([129, null, 88, "test"]);
  await sink.addStream(stream4).then((x) { cnt++; });
  await sink.addStream(stream5).then((x) { cnt++; });
  sink.writeln("This is a test");
  sink.writeAll([129, null, 88, "test"]);
  sink.writeAll([0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0]);
  await sink.flush().then((x) {
    Expect.equals(14, cnt);
    flushed++;
  });
  await sink.close();
  Expect.equals(1, flushed);
  asyncEnd();
}

main() {
  asyncStart();
  test();
}