Symfony\Component\DomCrawler\Tests\CrawlerTest::testParents PHP Method

    public function testParents()
    {
        $crawler = $this->createTestCrawler()->filterXPath('//li[1]');
        $this->assertNotSame($crawler, $crawler->parents(), '->parents() returns a new instance of a crawler');
        $this->assertInstanceOf('Symfony\\Component\\DomCrawler\\Crawler', $crawler, '->parents() returns a new instance of a crawler');

        $nodes = $crawler->parents();
        $this->assertEquals(3, $nodes->count());

        $nodes = $this->createTestCrawler()->filterXPath('//html')->parents();
        $this->assertEquals(0, $nodes->count());

        try {
            $this->createTestCrawler()->filterXPath('//ol')->parents();
            $this->fail('->parents() throws an \InvalidArgumentException if the node list is empty');
        } catch (\InvalidArgumentException $e) {
            $this->assertTrue(true, '->parents() throws an \InvalidArgumentException if the node list is empty');
        }
    }