<!DOCTYPE html>
<meta charset=utf-8>
<title>ChildNode.before</title>
<link rel=help href="https://dom.spec.whatwg.org/#dom-childnode-before">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>

function test_before(child, nodeName, innerHTML) {

    test(function() {
        var parent = document.createElement('div');
        parent.appendChild(child);
        child.before();
        assert_equals(parent.innerHTML, innerHTML);
    }, nodeName + '.before() without any argument.');

    test(function() {
        var parent = document.createElement('div');
        parent.appendChild(child);
        child.before(null);
        var expected = 'null' + innerHTML;
        assert_equals(parent.innerHTML, expected);
    }, nodeName + '.before() with null as an argument.');

    test(function() {
        var parent = document.createElement('div');
        parent.appendChild(child);
        child.before(undefined);
        var expected = 'undefined' + innerHTML;
        assert_equals(parent.innerHTML, expected);
    }, nodeName + '.before() with undefined as an argument.');

    test(function() {
        var parent = document.createElement('div');
        parent.appendChild(child);
        child.before('');
        assert_equals(parent.firstChild.data, '');
    }, nodeName + '.before() with the empty string as an argument.');

    test(function() {
        var parent = document.createElement('div');
        parent.appendChild(child);
        child.before('text');
        var expected = 'text' + innerHTML;
        assert_equals(parent.innerHTML, expected);
    }, nodeName + '.before() with only text as an argument.');

    test(function() {
        var parent = document.createElement('div');
        var x = document.createElement('x');
        parent.appendChild(child);
        child.before(x);
        var expected = '<x></x>' + innerHTML;
        assert_equals(parent.innerHTML, expected);
    }, nodeName + '.before() with only one element as an argument.');

    test(function() {
        var parent = document.createElement('div');
        var x = document.createElement('x');
        parent.appendChild(child);
        child.before(x, 'text');
        var expected = '<x></x>text' + innerHTML;
        assert_equals(parent.innerHTML, expected);
    }, nodeName + '.before() with one element and text as arguments.');

    test(function() {
        var parent = document.createElement('div');
        parent.appendChild(child);
        child.before('text', child);
        var expected = 'text' + innerHTML;
        assert_equals(parent.innerHTML, expected);
    }, nodeName + '.before() with context object itself as the argument.');

    test(function() {
        var parent = document.createElement('div')
        var x = document.createElement('x');
        parent.appendChild(child);
        parent.appendChild(x);
        child.before(x, child);
        var expected = '<x></x>' + innerHTML;
        assert_equals(parent.innerHTML, expected);
    }, nodeName + '.before() with context object itself and node as the arguments, switching positions.');

    test(function() {
        var parent = document.createElement('div');
        var x = document.createElement('x');
        var y = document.createElement('y');
        var z = document.createElement('z');
        parent.appendChild(y);
        parent.appendChild(child);
        parent.appendChild(x);
        child.before(x, y, z);
        var expected = '<x></x><y></y><z></z>' + innerHTML;
        assert_equals(parent.innerHTML, expected);
    }, nodeName + '.before() with all siblings of child as arguments.');

    test(function() {
        var parent = document.createElement('div')
        var x = document.createElement('x');
        var y = document.createElement('y');
        var z = document.createElement('z');
        parent.appendChild(x);
        parent.appendChild(y);
        parent.appendChild(z);
        parent.appendChild(child);
        child.before(y, z);
        var expected = '<x></x><y></y><z></z>' + innerHTML;
        assert_equals(parent.innerHTML, expected);
    }, nodeName + '.before() with some siblings of child as arguments; no changes in tree; viable sibling is first child.');

    test(function() {
        var parent = document.createElement('div')
        var v = document.createElement('v');
        var x = document.createElement('x');
        var y = document.createElement('y');
        var z = document.createElement('z');
        parent.appendChild(v);
        parent.appendChild(x);
        parent.appendChild(y);
        parent.appendChild(z);
        parent.appendChild(child);
        child.before(y, z);
        var expected = '<v></v><x></x><y></y><z></z>' + innerHTML;
        assert_equals(parent.innerHTML, expected);
    }, nodeName + '.before() with some siblings of child as arguments; no changes in tree.');

    test(function() {
        var parent = document.createElement('div');
        var x = document.createElement('x');
        var y = document.createElement('y');
        parent.appendChild(x);
        parent.appendChild(y);
        parent.appendChild(child);
        child.before(y, x);
        var expected = '<y></y><x></x>' + innerHTML;
        assert_equals(parent.innerHTML, expected);
    }, nodeName + '.before() when pre-insert behaves like prepend.');

    test(function() {
        var parent = document.createElement('div');
        var x = document.createElement('x');
        parent.appendChild(x);
        parent.appendChild(document.createTextNode('1'));
        var y = document.createElement('y');
        parent.appendChild(y);
        parent.appendChild(child);
        child.before(x, '2');
        var expected = '1<y></y><x></x>2' + innerHTML;
        assert_equals(parent.innerHTML, expected);
    }, nodeName + '.before() with one sibling of child and text as arguments.');

    test(function() {
        var x = document.createElement('x');
        var y = document.createElement('y');
        x.before(y);
        assert_equals(x.previousSibling, null);
    }, nodeName + '.before() on a child without any parent.');
}

test_before(document.createComment('test'), 'Comment', '<!--test-->');
test_before(document.createElement('test'), 'Element', '<test></test>');
test_before(document.createTextNode('test'), 'Text', 'test');

</script>
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