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how to test HEAD section contains link to CSS file in conditional comments
<!DOCTYPE html>
<html>
    <head>
        <title></title>
        <link href="/css/blueprint/screen.css" media="screen, projection" rel="stylesheet" type="text/css" />
        <!--[if lt IE 8]> <link href="/css/blueprint/ie.css" media="screen, projection" rel="stylesheet" type="text/css" /><![endif]-->

<?php
class BlueprintTest extends Zend_Test_PHPUnit_ControllerTestCase
{
    public function setUp()
    {
        $this->bootstrap = new Zend_Application(APPLICATION_ENV,
                        APPLICATION_PATH . '/configs/application.ini');
        parent::setUp();
    }

/**
 * this test FAILS
 */
public function testBlueprintMSIEScreenCssIncluded()
{
    $this->dispatch('/');
    $xpath = '/html/head/link'
           . '[@rel="stylesheet"]'
           . '[@href="/css/blueprint/ie.css"]'
           . '[@type="text/css"]'
           . '[@media="screen, projection"]';
    $this->assertXpathCount($xpath, 1);
}

/**
 * this test passes, but i do not like the way it is done:
 */
public function testBlueprintMSIECssIncludedUsingUglyLongGeneratedRegex()
{
    $this->dispatch('/');
    $p = array(
        'rels*=s*"stylesheet"',
        'hrefs*=s*"/css/blueprint/ie.css"',
        'types*=s*"text/css"',
        'medias*=s*"screen, projection"'
    );
    $tmp = array();
    foreach($p as $a) {
        foreach($p as $b) {
            if($b == $a) continue;
            foreach($p as $c) {
                if($c == $a || $c == $b) continue;
                foreach($p as $d) {
                    if($d == $a || $d == $b || $d == $c) continue;
                    $tmp[] = "($as+$bs+$cs+$d)";
                }
            }
        }
    }

    $pattern = '#<!--[if lt IE 8]>[sn]*'
        . '<links+' . implode("|", $tmp) . 's*[/]*>[sn]*'
        . '<![endif]-->#im';
    $this->assertQueryContentRegex('html head', $pattern);
}