public function testToString()
{
$p = new Page(null, 'Letter', null, null, 5);
$p = new Page(null, null, 612, 792, 5);
$this->assertContains('MediaBox[0 0 612 792]', (string) $p);
$p = new Page("5 0 obj\n<</Type/Page/Parent 2 0 R/MediaBox[0 0 612 792]/Contents[ 0 R]/Resources<</ProcSet[/PDF/Text/ImageB/ImageC/ImageI]>>>>\nendobj\n>>");
$this->assertContains('MediaBox[0 0 612 792]', (string) $p);
}