Keep only specific id Laravel - development

Keep only specific id Laravel

I have a table Foo

id

1 
2 
3 
4 
5

i have a table Bar

foo_id = 1 test = 1
foo_id = 2 test = 0
foo_id = 4 test = 1
foo_id = 5 test = 1

I want to retrieve id from foo where bar test = 0 or not exist in bar.

I have

$id = Foo::with('bar')->whereHas('bar', function ($q)
  {$q->where('test', '=', 0)
  ->orWhereNull(foo_id???????);})
->get();

How can i write this down?

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