public function testConcatenationCss()
{
$files = [new Local(APP . 'css/reset/reset.css'), new Local(APP . 'css/nav.css')];
$target = new AssetTarget(TMP . 'all.css', $files);
$compiler = $this->instance();
$result = $compiler->generate($target);
$expected = <<<TEXT
* {
margin:0;
padding:0;
}
@import url("reset/reset.css");
#nav {
width:100%;
}
TEXT;
$this->assertEquals($expected, $result);
}