$this->assertInstanceOf(\DateTime::class, $content->getCreatedAt());
$this->assertSame('2016-09-08', $content->getCreatedAt()->format('Y-m-d'));
$this->assertInstanceOf(\DateTime::class, $content->getCreatedAt());
$this->assertSame('2016-09-08', $content->getCreatedAt()->format('Y-m-d'));