public function testBundleShouldUseCssFilters()
{
$filter = $this->getMock('\\DotsUnited\\BundleFu\\Filter\\FilterInterface');
$filter->expects($this->at(0))->method('filterFile')->will($this->returnValue('filtered1'));
$filter->expects($this->at(1))->method('filter')->will($this->returnValue('filtered2'));
$this->bundle->setCssFilter($filter);
$this->bundle->start();
echo '<link href="/css/css_1.css?1000" media="screen" rel="stylesheet" type="text/css">';
$this->bundle->end();
$this->bundle->render();
$this->assertFileMatch($this->bundle->getCssBundlePath(), 'filtered2');
}