Language/Expressions/Function_Invocation/async_invokation_t02.dart

// Copyright (c) 2016, 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 If f is marked async, then a fresh instance o implementing the
 * built-in class Future is associated with the invocation and immediately
 * returned to the caller. The body of f is scheduled for execution at some
 * future time. The future o will complete when f terminates. The value used
 * to complete o is the current return value, if it is defined, and the
 * current exception otherwise.
 *
 * @description Check that body of the function is executed once at some future
 * time after a fresh Future instance is returned to the caller.
 *
 * @author a.semenov@unipro.ru
 */
import 'dart:async';
import '../../../Utils/expect.dart';

int count = 0;

Future test() async {
  ++count;
  return 1;
}

main() {
  Future f = test();

  f.then((v) {});
  f.then((v) {});
  f.then((v) {});
  f.then((v) {});
  f.then((v) {});
  f.then((v) {});
  f.then((v) {});
  f.then((v) {});
  f.then((v) {});
  f.then((v) {});

  Expect.equals(1, count);
}