      assert_equals(parent.innerHTML, expected);
    }, nodeName + '.after() with undefined as an argument.');

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

    test(function() {
        var parent = document.createElement('div');
        parent.appendChild(child);
        child.after('text');
        