Show Facilities in Apartment Details

I think there is this not right syntax in ApartmentShowTest This line:

$response->assertJsonFragment($expectedFacilityArray, 'facility_categories');

This is right syntax one is:

$response->assertJsonFragment(['facility_categories' => $expectedFacilityArray]);

see more in Laravel documentation: https://laravel.com/docs/10.x/http-tests#assert-json-fragment

Hi, i am getting this error when i run my test assertCount(): Argument #2 ($haystack) must be of type Countable|iterable, null given, called in C:\laragon\www\BookingApp\vendor\lar avel\framework\src\Illuminate\Testing\AssertableJsonString.php on line 74

$response = $this->getJson('/api/apartments/'.$apartment->id); 61▕ $response->assertStatus(200); 62▕ $response->assertJsonPath('name', $apartment->name); ➜ 63▕ $response->assertJsonCount(2, 'facility_categories'); 64▕ 65▕ $expectedFacilityArray = [ 66▕ $firstCategory->name => [ 67▕ $firstFacility->name,

Pls what should i do i don't understand this error message

$response = $this->getJson('/api/apartments/'.$apartment->id);
       $response->assertStatus(200);
       $response->assertJsonPath('name', $apartment->name);
       $response->assertJsonCount(2, 'facility_categories');
 
       $expectedFacilityArray = [
           $firstCategory->name => [
               $firstFacility->name,
               $secondFacility->name
           ],
           $secondCategory->name => [
               $thirdFacility->name
           ]
       ];
 
       $response->assertJsonFragment($expectedFacilityArray, 'facility_categories');
               ```