1// Copyright 2012 the V8 project authors. All rights reserved.
2// Redistribution and use in source and binary forms, with or without
3// modification, are permitted provided that the following conditions are
4// met:
5//
6//     * Redistributions of source code must retain the above copyright
7//       notice, this list of conditions and the following disclaimer.
8//     * Redistributions in binary form must reproduce the above
9//       copyright notice, this list of conditions and the following
10//       disclaimer in the documentation and/or other materials provided
11//       with the distribution.
12//     * Neither the name of Google Inc. nor the names of its
13//       contributors may be used to endorse or promote products derived
14//       from this software without specific prior written permission.
15//
16// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
28// Flags: --allow-natives-syntax
29
30var ordering = [];
31function reset() {
32  ordering = [];
33}
34
35function assertArrayValues(expected, actual) {
36  assertEquals(expected.length, actual.length);
37  for (var i = 0; i < expected.length; i++) {
38    assertEquals(expected[i], actual[i]);
39  }
40}
41
42function assertOrdering(expected) {
43  %RunMicrotasks();
44  assertArrayValues(expected, ordering);
45}
46
47function newPromise(id, fn) {
48  var r;
49  var t = 1;
50  var promise = new Promise(function(resolve) {
51    r = resolve;
52    if (fn) fn();
53  });
54
55  var next = promise.then(function(value) {
56    ordering.push('p' + id);
57    return value;
58  });
59
60  return {
61    resolve: r,
62    then: function(fn) {
63      next = next.then(function(value) {
64        ordering.push('p' + id + ':' + t++);
65        return fn ? fn(value) : value;
66      });
67
68      return this;
69    }
70  };
71}
72
73function newObserver(id, fn, obj) {
74  var observer = {
75    value: 1,
76    recordCounts: []
77  };
78
79  Object.observe(observer, function(records) {
80    ordering.push('o' + id);
81    observer.recordCounts.push(records.length);
82    if (fn) fn();
83  });
84
85  return observer;
86}
87
88
89(function PromiseThens() {
90  reset();
91
92  var p1 = newPromise(1).then();
93  var p2 = newPromise(2).then();
94
95  p1.resolve();
96  p2.resolve();
97
98  assertOrdering(['p1', 'p2', 'p1:1', 'p2:1']);
99})();
100
101
102(function ObserversBatch() {
103  reset();
104
105  var p1 = newPromise(1);
106  var p2 = newPromise(2);
107  var p3 = newPromise(3);
108
109  var ob1 = newObserver(1);
110  var ob2 = newObserver(2, function() {
111    ob3.value++;
112    p3.resolve();
113    ob1.value++;
114  });
115  var ob3 = newObserver(3);
116
117  p1.resolve();
118  ob1.value++;
119  p2.resolve();
120  ob2.value++;
121
122  assertOrdering(['p1', 'o1', 'o2', 'p2', 'o1', 'o3', 'p3']);
123  assertArrayValues([1, 1], ob1.recordCounts);
124  assertArrayValues([1], ob2.recordCounts);
125  assertArrayValues([1], ob3.recordCounts);
126})();
127
128
129(function ObserversGetAllRecords() {
130  reset();
131
132  var p1 = newPromise(1);
133  var p2 = newPromise(2);
134  var ob1 = newObserver(1, function() {
135    ob2.value++;
136  });
137  var ob2 = newObserver(2);
138
139  p1.resolve();
140  ob1.value++;
141  p2.resolve();
142  ob2.value++;
143
144  assertOrdering(['p1', 'o1', 'o2', 'p2']);
145  assertArrayValues([1], ob1.recordCounts);
146  assertArrayValues([2], ob2.recordCounts);
147})();
148
149
150(function NewObserverDeliveryGetsNewMicrotask() {
151  reset();
152
153  var p1 = newPromise(1);
154  var p2 = newPromise(2);
155  var ob1 = newObserver(1);
156  var ob2 = newObserver(2, function() {
157    ob1.value++;
158  });
159
160  p1.resolve();
161  ob1.value++;
162  p2.resolve();
163  ob2.value++;
164
165  assertOrdering(['p1', 'o1', 'o2', 'p2', 'o1']);
166  assertArrayValues([1, 1], ob1.recordCounts);
167  assertArrayValues([1], ob2.recordCounts);
168})();
169