How to test I get the same number of categories as same as the database

Here is my test, I use factory first to create some categories, then hit the endpoint /categories , but I don't know how to test if I get the same number of categories, and also in my test I am not approaching my $response from the endpoint.

public function test_it_can_retrive_list_of_categories()
{

    Category::factory()->count(5)->create();

    $response = $this->get('/categories');
    
    $this->assertDatabaseCount($this->table, 5); // Don't know how to test.

}

Any help would be appreciated