public function test_create_at_MUST_be_modified_during_save()
{
$node = new Node();
$node->title = "Example";
$this->assertTrue($node->updated_at->is_empty);
$node->save();
$now = DateTime::now()->utc;
$this->assertFalse($node->created_at->is_empty);
$this->assertEquals($now, $node->created_at);
$node->updated_at = '-2 week';
$node->save();
$this->assertEquals($now, $node->created_at);
$node->delete();
}
