How test unauthorized method in Laravel?

I have controller Post with typical CRUD method's. I have a PostPolicy, in which:

public function destroy(User $user, Post $post)
{
    $user->id === $post->author_id;
}

I want to write test for this. When I check if user delete his own post - all OK.

But when I test if other user user can delete not his own post, laravel test send error:

Illuminate\Auth\Access\AuthorizationException: This action is unauthorized.

How bypass it or which has another method for write this test?

Code

$user = factory(User::class)->create([
        'id' => 3,
        'role_id' => 2
    ]);
factory(Post::class)->create([
        'id' => 30,
        'editor_id' => 2,
    ]);

    $this->delete('/api/posts/30', [], [
        'authorization' => "Bearer {$user->api_token}",
        'accept' => 'application/json',
    ])->assertJson([

    ]);;

via Chebli Mohamed