/**
* @return null
*/
public function testAddJsHeadScriptTagsNoDuplicates()
{
$src = 'my-file.js';
$tag1 = new Script();
$tag1->addAttribute('src', $src);
$tag2 = new Script();
$tag2->addAttribute('src', $src);
$this->assertFalse($this->htmlDoc->isJsHeadScript($src));
$this->htmlDoc->addJsHeadScriptTag($tag1)->addJsHeadScriptTag($tag2);
$this->assertTrue($this->htmlDoc->isJsHeadScript($src));
$expected = array($tag2);
$this->assertEquals($expected, $this->htmlDoc->getJsHeadScriptTags());
}
