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// Copyright (c) 2011, 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
library mutationobserver_test;
import 'dart:async';
import 'dart:html';
import 'package:expect/minitest.dart';
// Due to https://code.google.com/p/chromium/issues/detail?id=329103
// mutationObservers sometimes do not fire if the node being observed is GCed
// so we keep around references to all nodes we have created mutation
// observers for.
var keepAlive = [];
void testSupported() {
expect(MutationObserver.supported, true);
}
mutationCallback(Completer done, int count, expectation) {
final nodes = [];
callback(mutations, observer) {
for (MutationRecord mutation in mutations) {
for (Node node in mutation.addedNodes) {
nodes.add(node);
}
}
if (nodes.length >= count) {
expect(nodes.length, count);
expect(nodes, expectation);
done.complete();
}
}
// If it's not supported, don't block waiting for it.
if (!MutationObserver.supported) {
done.complete();
return (mutations, observer) {};
}
return callback;
}
void testEmptyOptionsIsSyntaxError(expectation) {
expect(() {
var mutationObserver = new MutationObserver((mutations, observer) {
expect(false, isTrue, reason: 'Should not be reached');
});
expect(() {
mutationObserver.observe(document);
}, throws);
}, expectation);
}
Future<Null> testDirectParallelOptionsNamed(expectation) {
final done = new Completer<Null>();
expect(() {
var container = new DivElement();
keepAlive.add(container);
var div1 = new DivElement();
var div2 = new DivElement();
var mutationObserver =
new MutationObserver(mutationCallback(done, 2, equals([div1, div2])));
mutationObserver.observe(container, childList: true);
container.append(div1);
container.append(div2);
}, expectation);
return done.future;
}
Future<Null> testDirectNestedOptionsNamed(expectation) {
final done = new Completer<Null>();
expect(() {
var container = new DivElement();
keepAlive.add(container);
var div1 = new DivElement();
var div2 = new DivElement();
var mutationObserver =
new MutationObserver(mutationCallback(done, 1, equals([div1])));
mutationObserver.observe(container, childList: true);
container.append(div1);
div1.append(div2);
}, expectation);
return done.future;
}
Future<Null> testSubtreeOptionsNamed(expectation) {
final done = new Completer<Null>();
expect(() {
var container = new DivElement();
keepAlive.add(container);
var div1 = new DivElement();
var div2 = new DivElement();
var mutationObserver =
new MutationObserver(mutationCallback(done, 2, equals([div1, div2])));
mutationObserver.observe(container, childList: true, subtree: true);
container.append(div1);
div1.append(div2);
}, expectation);
return done.future;
}
/**
* Test suite for Mutation Observers. This is just a small set of sanity
* checks, not a complete test suite.
*/
main() async {
testSupported();
final expectation = MutationObserver.supported ? returnsNormally : throws;
testEmptyOptionsIsSyntaxError(expectation);
await testDirectParallelOptionsNamed(expectation);
await testDirectNestedOptionsNamed(expectation);
await testSubtreeOptionsNamed(expectation);
}