() {assert_equals(newParent.children.length, 1)},
    "With .append, New parent should now have 1 child");
test(function() {assert_equals(newParent.children[0], child)},
    "With .append, New parent should now have correct child");

// Test that calling append() with an existing child causes that child to be moved
// to the end of the list of children.
var sibling = new Animation(elem, animFunc, 1.0);
var animationSequence = new AnimationSequence([child, sibling]);
test(function() {assert_equals(animationS