public function testDoesntAlterAST()
{
$kitchenSink = file_get_contents(__DIR__ . '/kitchen-sink.graphql');
$ast = Parser::parse($kitchenSink);
$astCopy = $ast->cloneDeep();
$this->assertEquals($astCopy, $ast);
Printer::doPrint($ast);
$this->assertEquals($astCopy, $ast);
}