$this->assertArrayHasKey('language', $content[0]);
$this->assertArrayHasKey('reading_time', $content[0]);
$this->assertArrayHasKey('domain_name', $content[0]);
$this->assertArrayHasKey('language', $content[0]);
$this->assertArrayHasKey('reading_time', $content[0]);
$this->assertArrayHasKey('domain_name', $content[0]);