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Unified Diff: third_party/WebKit/LayoutTests/imported/web-platform-tests/web-animations/animation-node/animation-node-previous-sibling.html

Issue 1866333004: Import web-platform-tests@5a8700479d98852455bee6117558897867eb278a (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@wpt-sync
Patch Set: Add Failure option for two TestExpectations entries Created 4 years, 8 months ago
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Index: third_party/WebKit/LayoutTests/imported/web-platform-tests/web-animations/animation-node/animation-node-previous-sibling.html
diff --git a/third_party/WebKit/LayoutTests/imported/web-platform-tests/web-animations/animation-node/animation-node-previous-sibling.html b/third_party/WebKit/LayoutTests/imported/web-platform-tests/web-animations/animation-node/animation-node-previous-sibling.html
new file mode 100644
index 0000000000000000000000000000000000000000..16f19364760ce4a6ef3a6777a5ee7d901fbe1bd4
--- /dev/null
+++ b/third_party/WebKit/LayoutTests/imported/web-platform-tests/web-animations/animation-node/animation-node-previous-sibling.html
@@ -0,0 +1,511 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>AnimationNode previousSibling attribute tests</title>
+<meta name="assert" content="The previous sibling of this animation node">
+<link rel="help" href="http://w3c.github.io/web-animations/#dom-animationnode-previoussibling">
+<link rel="help" href="http://www.w3.org/TR/dom/#concept-tree-previous-sibling">
+<link rel="author" title="Sergey G. Grekhov" href="mailto:sgrekhov@unipro.ru">
+<link rel="author" title="Aleksei Yu. Semenov" href="mailto:a.semenov@unipro.ru">
+<script src="../../../../resources/testharness.js"></script>
+<script src="../../../../resources/testharnessreport.js"></script>
+<script src="../testcommon.js"></script>
+<body>
+<div id="log"></div>
+<script>
+test(function() {
+ var nodes = [
+ newAnimation(createDiv(this)),
+ new AnimationGroup([]),
+ new AnimationSequence([])
+ ];
+ nodes.forEach(function(node) {
+ assert_equals(node.previousSibling, null, type(node) + '.previousSibling should be null');
+ });
+}, 'AnimationNode.previousSibling is null if the node is standalone');
+
+test(function() {
+ var test = this;
+ var parents = [AnimationGroup, AnimationSequence];
+ parents.forEach(function(parentCtor) {
+ var nodes = [newAnimation(createDiv(test)), new AnimationGroup([]), new AnimationSequence([])];
+ nodes.forEach(function(node) {
+ var parent = new parentCtor([node]);
+
+ assert_equals(node.previousSibling, null, type(node) + '.previousSibling ' +
+ 'should be null');
+ });
+ });
+}, 'AnimationNode.previousSibling is null if the node is the only child of its parent');
+
+test(function() {
+ var test = this;
+ var parents = [AnimationGroup, AnimationSequence];
+ parents.forEach(function(parentCtor) {
+ var nodes = [newAnimation(createDiv(test)), new AnimationGroup([]), new AnimationSequence([])];
+ nodes.forEach(function(node1) {
+ var node2 = newAnimation(createDiv(test));
+ var parent = new parentCtor([node1, node2]);
+
+ assert_equals(node1.previousSibling, null, type(node1) + '.previousSibling should be null');
+ assert_equals(node2.previousSibling, node1, type(node2) + '.previousSibling should return ' +
+ 'previous sibling of this animation node');
+ });
+ });
+}, 'AnimationNode.previousSibling returns previous sibling of this animation node. Test first child');
+
+test(function() {
+ var test = this;
+ var parents = [AnimationGroup, AnimationSequence];
+ parents.forEach(function(parentCtor) {
+ var nodes = [newAnimation(createDiv(test)), new AnimationGroup([]), new AnimationSequence([])];
+ nodes.forEach(function(node2) {
+ var node1 = newAnimation(createDiv(test));
+ var parent = new parentCtor([node1, node2]);
+
+ assert_equals(node1.previousSibling, null, type(node1) + '.previousSibling should be null');
+ assert_equals(node2.previousSibling, node1, type(node2) + '.previousSibling should return ' +
+ 'previous sibling of this animation node');
+ });
+ });
+}, 'AnimationNode.previousSibling returns previous sibling of this animation node. Test second child');
+
+test(function() {
+ var node1 = newAnimation(createDiv(this));
+ var node2 = newAnimation(createDiv(this));
+ var node3 = newAnimation(createDiv(this));
+ var node4 = newAnimation(createDiv(this));
+ var node5 = newAnimation(createDiv(this));
+ var node6 = newAnimation(createDiv(this));
+ var node7 = new AnimationGroup([node3, node4]);
+ var node8 = new AnimationGroup([node5, node6]);
+ var node9 = newAnimation(createDiv(this));
+ var group = new AnimationGroup([node1, node2, node7, node8, node9]);
+
+ assert_equals(group.previousSibling, null, 'AnimationNode.previousSibling should return ' +
+ 'null (root node)');
+ assert_equals(node1.previousSibling, null, 'AnimationNode.previousSibling should return ' +
+ 'null for the first node in the group');
+ assert_equals(node2.previousSibling, node1, 'AnimationNode.previousSibling should return ' +
+ 'previous sibling of this animation node');
+ assert_equals(node3.previousSibling, null, 'AnimationNode.previousSibling should be null ' +
+ 'for the first node in the nested group');
+ assert_equals(node4.previousSibling, node3, 'AnimationNode.previousSibling should return ' +
+ 'previous sibling of this animation node (first node in the nested group)');
+ assert_equals(node5.previousSibling, null, 'AnimationNode.previousSibling should be null ' +
+ 'for the first node in the second nested group');
+ assert_equals(node6.previousSibling, node5, 'AnimationNode.previousSibling should return ' +
+ 'previous sibling of this animation node (first node in the second nested group)');
+ assert_equals(node7.previousSibling, node2, 'AnimationNode.previousSibling should return ' +
+ 'previous sibling of this animation node (first nested group)');
+ assert_equals(node8.previousSibling, node7, 'AnimationNode.previousSibling should return ' +
+ 'previous sibling of this animation node (second nested group)');
+ assert_equals(node9.previousSibling, node8, 'AnimationNode.previousSibling should return ' +
+ 'previous sibling of this animation node');
+}, 'AnimationNode.previousSibling returns previous sibling of this animation node. Test ' +
+ 'tree structure with AnimationGroup');
+
+test(function() {
+ var node1 = newAnimation(createDiv(this));
+ var node2 = newAnimation(createDiv(this));
+ var node3 = newAnimation(createDiv(this));
+ var node4 = newAnimation(createDiv(this));
+ var node5 = newAnimation(createDiv(this));
+ var node6 = newAnimation(createDiv(this));
+ var node7 = new AnimationSequence([node3, node4]);
+ var node8 = new AnimationSequence([node5, node6]);
+ var node9 = newAnimation(createDiv(this));
+ var sequence = new AnimationSequence([node1, node2, node7, node8, node9]);
+
+ assert_equals(sequence.previousSibling, null, 'AnimationNode.previousSibling should return ' +
+ 'null (root node)');
+ assert_equals(node1.previousSibling, null, 'AnimationNode.previousSibling should return ' +
+ 'null for the first node in the group');
+ assert_equals(node2.previousSibling, node1, 'AnimationNode.previousSibling should return ' +
+ 'previous sibling of this animation node');
+ assert_equals(node3.previousSibling, null, 'AnimationNode.previousSibling should be null ' +
+ 'for the first node in the nested group');
+ assert_equals(node4.previousSibling, node3, 'AnimationNode.previousSibling should return ' +
+ 'previous sibling of this animation node (first node in the nested group)');
+ assert_equals(node5.previousSibling, null, 'AnimationNode.previousSibling should be null ' +
+ 'for the first node in the second nested group');
+ assert_equals(node6.previousSibling, node5, 'AnimationNode.previousSibling should return ' +
+ 'previous sibling of this animation node (first node in the second nested group)');
+ assert_equals(node7.previousSibling, node2, 'AnimationNode.previousSibling should return ' +
+ 'previous sibling of this animation node (first nested group)');
+ assert_equals(node8.previousSibling, node7, 'AnimationNode.previousSibling should return ' +
+ 'previous sibling of this animation node (second nested group)');
+ assert_equals(node9.previousSibling, node8, 'AnimationNode.previousSibling should return ' +
+ 'previous sibling of this animation node');
+}, 'AnimationNode.previousSibling returns previous sibling of this animation node. Test ' +
+ 'tree structure with AnimationSequence');
+
+test(function() {
+ var test = this;
+ var parents = [AnimationGroup, AnimationSequence];
+ parents.forEach(function(parentCtor) {
+ var nodes = [newAnimation(createDiv(test)), new AnimationGroup([]), new AnimationSequence([])];
+ nodes.forEach(function(node2) {
+ var node1 = newAnimation(createDiv(test));
+ var node3 = newAnimation(createDiv(test));
+ var parent = new parentCtor([node1, node2]);
+ node2.before(node3);
+
+ assert_equals(node1.previousSibling, null, type(node2) + '.before() should update ' +
+ 'previous sibling of animation node');
+ assert_equals(node3.previousSibling, node1, type(node2) + '.before() should update ' +
+ 'previous sibling of animation node');
+ assert_equals(node2.previousSibling, node3, type(node2) + '.before() should update ' +
+ 'previous sibling of animation node');
+ });
+ });
+}, 'AnimationNode.previousSibling returns previous sibling of this animation node, ' +
+ 'the previous sibling is changed by method before()');
+
+test(function() {
+ var test = this;
+ var parents = [AnimationGroup, AnimationSequence];
+ parents.forEach(function(parentCtor) {
+ var nodes = [newAnimation(createDiv(test)), new AnimationGroup([]), new AnimationSequence([])];
+ nodes.forEach(function(node3) {
+ var node1 = newAnimation(createDiv(test));
+ var node2 = newAnimation(createDiv(test));
+ var parent1 = new parentCtor([node1, node2]);
+ var parent2 = new parentCtor([node3]);
+
+ node3.before(node1);
+
+ assert_equals(node1.previousSibling, null, type(node3) + '.before() should update ' +
+ 'previous sibling of animation node');
+ assert_equals(node2.previousSibling, null, type(node3) + '.before() should update ' +
+ 'previous sibling of animation node');
+ assert_equals(node3.previousSibling, node1, type(node3) + '.before() should update ' +
+ 'previous sibling of animation node');
+ });
+ });
+}, 'AnimationNode.previousSibling returns previous sibling of this animation node, ' +
+ 'the previous sibling is removed by method before()');
+
+test(function() {
+ var test = this;
+ var parents = [AnimationGroup, AnimationSequence];
+ parents.forEach(function(parentCtor) {
+ var nodes = [newAnimation(createDiv(test)), new AnimationGroup([]), new AnimationSequence([])];
+ nodes.forEach(function(node2) {
+ var node1 = newAnimation(createDiv(test));
+ var node3 = newAnimation(createDiv(test));
+ var node4 = new AnimationGroup([]);
+ var node5 = new AnimationSequence([]);
+ var parent = new parentCtor([node1, node2]);
+ node2.before(node3, node4, node5);
+
+ assert_equals(node1.previousSibling, null, type(node2) + '.before() should update ' +
+ 'previous sibling of animation node');
+ assert_equals(node3.previousSibling, node1, type(node2) + '.before() should update ' +
+ 'previous sibling of animation node');
+ assert_equals(node4.previousSibling, node3, type(node2) + '.before() should update ' +
+ 'previous sibling of animation node');
+ assert_equals(node5.previousSibling, node4, type(node2) + '.before() should update ' +
+ 'previous sibling of animation node');
+ assert_equals(node2.previousSibling, node5, type(node2) + '.before() should update ' +
+ 'previous sibling of animation node');
+ });
+ });
+}, 'AnimationNode.previousSibling returns previous sibling of this animation node, ' +
+ 'several nodes are added by method before()');
+
+test(function() {
+ var test = this;
+ var parents = [AnimationGroup, AnimationSequence];
+ parents.forEach(function(parentCtor) {
+ var nodes = [newAnimation(createDiv(test)), new AnimationGroup([]), new AnimationSequence([])];
+ nodes.forEach(function(node1) {
+ var node2 = newAnimation(createDiv(test));
+ var node3 = newAnimation(createDiv(test));
+ var parent = new parentCtor([node1, node2]);
+ node1.after(node3);
+
+ assert_equals(node1.previousSibling, null, type(node1) + '.after() should update ' +
+ 'previous sibling of animation node');
+ assert_equals(node3.previousSibling, node1, type(node1) + '.after() should update ' +
+ 'previous sibling of animation node');
+ assert_equals(node2.previousSibling, node3, type(node1) + '.after() should update ' +
+ 'previous sibling of animation node');
+ });
+ });
+}, 'AnimationNode.previousSibling returns previous sibling of this animation node, ' +
+ 'the previous sibling is changed by method after()');
+
+test(function() {
+ var test = this;
+ var parents = [AnimationGroup, AnimationSequence];
+ parents.forEach(function(parentCtor) {
+ var nodes = [newAnimation(createDiv(test)), new AnimationGroup([]), new AnimationSequence([])];
+ nodes.forEach(function(node3) {
+ var node1 = newAnimation(createDiv(test));
+ var node2 = newAnimation(createDiv(test));
+ var parent1 = new parentCtor([node1, node2]);
+ var parent2 = new parentCtor([node3]);
+
+ node3.after(node1);
+
+ assert_equals(node1.previousSibling, node3, type(node3) + '.after() should update ' +
+ 'previous sibling of animation node');
+ assert_equals(node2.previousSibling, null, type(node3) + '.after() should update ' +
+ 'previous sibling of animation node');
+ assert_equals(node3.previousSibling, null, type(node3) + '.after() should update ' +
+ 'previous sibling of animation node');
+ });
+ });
+}, 'AnimationNode.previousSibling returns previous sibling of this animation node, ' +
+ 'the previous sibling is removed by method after()');
+
+test(function() {
+ var test = this;
+ var parents = [AnimationGroup, AnimationSequence];
+ parents.forEach(function(parentCtor) {
+ var nodes = [newAnimation(createDiv(test)), new AnimationGroup([]), new AnimationSequence([])];
+ nodes.forEach(function(node1) {
+ var node2 = newAnimation(createDiv(test));
+ var node3 = newAnimation(createDiv(test));
+ var node4 = new AnimationGroup([]);
+ var node5 = new AnimationSequence([]);
+ var parent = new parentCtor([node1, node2]);
+ node1.after(node3, node4, node5);
+
+ assert_equals(node1.previousSibling, null, type(node1) + '.after() should update ' +
+ 'previous sibling of animation node');
+ assert_equals(node3.previousSibling, node1, type(node1) + '.after() should update ' +
+ 'previous sibling of animation node');
+ assert_equals(node4.previousSibling, node3, type(node1) + '.after() should update ' +
+ 'previous sibling of animation node');
+ assert_equals(node5.previousSibling, node4, type(node1) + '.after() should update ' +
+ 'previous sibling of animation node');
+ assert_equals(node2.previousSibling, node5, type(node1) + '.after() should update ' +
+ 'previous sibling of animation node');
+ });
+ });
+}, 'AnimationNode.previousSibling returns previous sibling of this animation node, ' +
+ 'several nodes are added by method after()');
+
+test(function() {
+ var test = this;
+ var parents = [AnimationGroup, AnimationSequence];
+ parents.forEach(function(parentCtor) {
+ var nodes = [newAnimation(createDiv(test)), new AnimationGroup([]), new AnimationSequence([])];
+ nodes.forEach(function(node2) {
+ var node1 = newAnimation(createDiv(test));
+ var node3 = newAnimation(createDiv(test));
+ var node4 = newAnimation(createDiv(test));
+ var parent = new parentCtor([node1, node2, node3]);
+ node2.replace(node4);
+
+ assert_equals(node4.previousSibling, node1, type(node2) + '.replace() should update ' +
+ 'previous sibling of animation node');
+ assert_equals(node2.previousSibling, null, type(node2) + '.replace() should update ' +
+ 'previous sibling of animation node');
+ assert_equals(node3.previousSibling, node4, type(node2) + '.replace() should update ' +
+ 'previous sibling of animation node');
+ });
+ });
+}, 'AnimationNode.previousSibling returns previous sibling of this animation node, ' +
+ 'the previous sibling is changed by method replace()');
+
+test(function() {
+ var test = this;
+ var parents = [AnimationGroup, AnimationSequence];
+ parents.forEach(function(parentCtor) {
+ var nodes = [newAnimation(createDiv(test)), new AnimationGroup([]), new AnimationSequence([])];
+ nodes.forEach(function(node4) {
+ var node1 = newAnimation(createDiv(test));
+ var node2 = newAnimation(createDiv(test));
+ var node3 = newAnimation(createDiv(test));
+ var parent1 = new parentCtor([node1, node2, node3]);
+ var parent2 = new parentCtor([node4]);
+
+ node4.replace(node2);
+
+ assert_equals(node3.previousSibling, node1, type(node4) + '.replace() should update ' +
+ 'previous sibling of animation node');
+ assert_equals(node2.previousSibling, null, type(node4) + '.replace() should update ' +
+ 'previous sibling of animation node');
+ });
+ });
+}, 'AnimationNode.previousSibling returns previous sibling of this animation node, ' +
+ 'the previous sibling is removed by method replace()');
+
+test(function() {
+ var test = this;
+ var parents = [AnimationGroup, AnimationSequence];
+ parents.forEach(function(parentCtor) {
+ var nodes = [newAnimation(createDiv(test)), new AnimationGroup([]), new AnimationSequence([])];
+ nodes.forEach(function(node2) {
+ var node1 = newAnimation(createDiv(test));
+ var node3 = newAnimation(createDiv(test));
+ var node4 = newAnimation(createDiv(test));
+ var node5 = new AnimationGroup([]);
+ var node6 = new AnimationSequence([]);
+ var parent = new parentCtor([node1, node2, node3]);
+ node2.replace(node4, node5, node6);
+
+ assert_equals(node4.previousSibling, node1, type(node2) + '.replace() should update ' +
+ 'previous sibling of animation node');
+ assert_equals(node5.previousSibling, node4, type(node2) + '.replace() should update ' +
+ 'previous sibling of animation node');
+ assert_equals(node6.previousSibling, node5, type(node2) + '.replace() should update ' +
+ 'previous sibling of animation node');
+ assert_equals(node3.previousSibling, node6, type(node2) + '.replace() should update ' +
+ 'previous sibling of animation node');
+ assert_equals(node2.previousSibling, null, type(node2) + '.replace() should update ' +
+ 'previous sibling of animation node');
+ });
+ });
+}, 'AnimationNode.previousSibling returns previous sibling of this animation node, ' +
+ 'several nodes are added by method replace()');
+
+test(function() {
+ var test = this;
+ var parents = [AnimationGroup, AnimationSequence];
+ parents.forEach(function(parentCtor) {
+ var nodes = [newAnimation(createDiv(test)), new AnimationGroup([]), new AnimationSequence([])];
+ nodes.forEach(function(node2) {
+ var node1 = newAnimation(createDiv(test));
+ var node3 = newAnimation(createDiv(test));
+ var parent = new parentCtor([node1, node2, node3]);
+ node2.remove();
+
+ assert_equals(node3.previousSibling, node1, type(node2) + '.replace() should update ' +
+ 'previous sibling of animation node');
+ assert_equals(node2.previousSibling, null, type(node2) + '.replace() should update ' +
+ 'previous sibling of animation node');
+ });
+ });
+}, 'AnimationNode.previousSibling returns previous sibling of this animation node, ' +
+ 'the previous sibling is changed by method remove()');
+
+test(function() {
+ var test = this;
+ var parents = [AnimationGroup, AnimationSequence];
+ parents.forEach(function(parentCtor) {
+ var nodes = [newAnimation(createDiv(test)), new AnimationGroup([]), new AnimationSequence([])];
+ nodes.forEach(function(node1) {
+ var node2 = newAnimation(createDiv(test));
+ var parent = new parentCtor([node1]);
+ parent.prepend(node2);
+
+ assert_equals(node1.previousSibling, node2, parentCtor.name + '.prepend() should update ' +
+ 'previous sibling of animation node');
+ });
+ });
+}, 'AnimationNode.previousSibling returns previous sibling of this animation node, ' +
+ 'the previous sibling is changed by method AnimationGroup.prepend()');
+
+test(function() {
+ var test = this;
+ var parents = [AnimationGroup, AnimationSequence];
+ parents.forEach(function(parentCtor) {
+ var nodes = [newAnimation(createDiv(test)), new AnimationGroup([]), new AnimationSequence([])];
+ nodes.forEach(function(node2) {
+ var node1 = newAnimation(createDiv(test));
+ var node3 = newAnimation(createDiv(test));
+ var parent1 = new parentCtor([node1, node2]);
+ var parent2 = new parentCtor([node3]);
+
+ parent2.prepend(node1);
+
+ assert_equals(node2.previousSibling, null, parentCtor.name + '.prepend() should update ' +
+ 'previous sibling of animation node');
+ assert_equals(node3.previousSibling, node1, parentCtor.name + '.prepend() should update ' +
+ 'previous sibling of animation node');
+ });
+ });
+}, 'AnimationNode.previousSibling returns previous sibling of this animation node, ' +
+ 'the previous sibling is removed by method AnimationGroup.prepend()');
+
+test(function() {
+ var test = this;
+ var parents = [AnimationGroup, AnimationSequence];
+ parents.forEach(function(parentCtor) {
+ var node1 = newAnimation(createDiv(test));
+ var node2 = new AnimationGroup([]);
+ var node3 = new AnimationSequence([]);
+ var node4 = newAnimation(createDiv(test));
+ var parent = new parentCtor([node1]);
+ parent.prepend(node2, node3, node4);
+
+ assert_equals(node2.previousSibling, null, parentCtor.name + '.prepend() should update ' +
+ 'previous sibling of animation node');
+ assert_equals(node3.previousSibling, node2, parentCtor.name + '.prepend() should update ' +
+ 'previous sibling of animation node');
+ assert_equals(node4.previousSibling, node3, parentCtor.name + '.prepend() should update ' +
+ 'previous sibling of animation node');
+ assert_equals(node1.previousSibling, node4, parentCtor.name + '.prepend() should update ' +
+ 'previous sibling of animation node');
+ });
+}, 'AnimationNode.previousSibling returns previous sibling of this animation node, ' +
+ 'several nodes are added by method AnimationGroup.prepend()');
+
+test(function() {
+ var test = this;
+ var parents = [AnimationGroup, AnimationSequence];
+ parents.forEach(function(parentCtor) {
+ var nodes = [newAnimation(createDiv(test)), new AnimationGroup([]), new AnimationSequence([])];
+ nodes.forEach(function(node2) {
+ var node1 = newAnimation(createDiv(test));
+ var parent = new parentCtor([node1]);
+ parent.append(node2);
+
+ assert_equals(node1.previousSibling, null, parentCtor.name + '.append() should update ' +
+ 'previous sibling of animation node');
+ assert_equals(node2.previousSibling, node1, parentCtor.name + '.append() should update ' +
+ 'previous sibling of animation node');
+ });
+ });
+}, 'AnimationNode.previousSibling returns previous sibling of this animation node, ' +
+ 'the previous sibling is changed by method AnimationGroup.append()');
+
+test(function() {
+ var test = this;
+ var parents = [AnimationGroup, AnimationSequence];
+ parents.forEach(function(parentCtor) {
+ var nodes = [newAnimation(createDiv(test)), new AnimationGroup([]), new AnimationSequence([])];
+ nodes.forEach(function(node2) {
+ var node1 = newAnimation(createDiv(test));
+ var node3 = newAnimation(createDiv(test));
+ var parent1 = new parentCtor([node1, node2]);
+ var parent2 = new parentCtor([node3]);
+
+ parent2.append(node1);
+
+ assert_equals(node2.previousSibling, null, parentCtor.name + '.append() should update ' +
+ 'previous sibling of animation node');
+ assert_equals(node1.previousSibling, node3, parentCtor.name + '.append() should update ' +
+ 'previous sibling of animation node');
+ });
+ });
+}, 'AnimationNode.previousSibling returns previous sibling of this animation node, ' +
+ 'the previous sibling is removed by method AnimationGroup.append()');
+
+test(function() {
+ var test = this;
+ var parents = [AnimationGroup, AnimationSequence];
+ parents.forEach(function(parentCtor) {
+ var nodes = [newAnimation(createDiv(test)), new AnimationGroup([]), new AnimationSequence([])];
+ nodes.forEach(function(node1) {
+ var node2 = newAnimation(createDiv(test));
+ var node3 = new AnimationGroup([]);
+ var node4 = new AnimationSequence([]);
+ var parent = new parentCtor([node1]);
+ parent.append(node2, node3, node4);
+
+ assert_equals(node2.previousSibling, node1, parentCtor.name + '.append() should update ' +
+ 'previous sibling of animation node');
+ assert_equals(node3.previousSibling, node2, parentCtor.name + '.append() should update ' +
+ 'previous sibling of animation node');
+ assert_equals(node4.previousSibling, node3, parentCtor.name + '.append() should update ' +
+ 'previous sibling of animation node');
+ });
+ });
+}, 'AnimationNode.previousSibling returns previous sibling of this animation node, ' +
+ 'several nodes are added by method AnimationGroup.append()');
+</script>
+</body>
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