assertInstanceOf(DoctypeInterface::class, $document->doctype());
$this->assertInstanceOf(HtmlTagInterface::class, $document->html());
$this->assertInstanceOf(BodyTagInterface::class, $document->body());
$this->assertInstanceOf(HeadTagInterface::class, $document->head());
// body and head are being passed properly
$this->assertTrue($document->body() === $document->html()->body());
$this->assertTrue($document->head() === $document->html()->head());
// everything has the correct document
$this->assertEquals($document, $document->doctype()->parentDocument());
$this->assertEquals($document, $document->html()->parentDocument());
$this->assertEquals($document, $document->body()->parentDocument());
$this->assertEquals($document, $document->head()->parentDocument());
// children are doctype and html
$this->assertEquals([$document->doctype(), $document->html()], $document->children());
// string version of an empty document
$this->assertEquals(
implode(
PHP_EOL,
[
'',
'',
'',
'Untitled',
'',
'',
''
]
),
$document->__toString()
);
}
}