buster document.fail?

gistfile1.txt

buster.testCase("modSource.getHtmlWithoutScripts", {
    "setUp": function () {
        $jt = jQuery.noConflict();
        var res = $jt.ajax('simple', {async:false, cache:false}).responseText;
        document.open('text/html', 'replace');
        document.write(res);
        document.close();
        this.doc = document;
    },
    "has function": function () {
        refute.equals(modSource.getHtmlWithoutScripts, "undefined");
    },
    "returns a string": function() {
        assert.equals("string", typeof modSource.getHtmlWithoutScripts(this.doc));
    },
    "return has no script tag": function() {
        res = modSource.getHtmlWithoutScripts(this.doc);
        assert.equals(res.search('script'), -1);
        assert.equals(res.search('SCRIPT'), -1);
    }
});