fillForm doesn't work while trying to test a Singular Resource

    /**
     * Configure the form for the page.
     */
    public function form(Schema $schema): Schema
    {
        return ContactForm::configure($schema)
            ->model(Contact::class)
            ->statePath('data');
    }

it('can create', function (): void {
    $newData = Contact::factory()->make();

    $this->actingAs($newData->user);

    livewire(ContactUs::class)
        ->fillForm([
            'subject' => $newData->subject,
            'message' => $newData->message,
        ])
        ->call('create')
        ->assertHasNoFormErrors();

    $this->assertDatabaseHas(Contact::class, [
        'user_id' => $newData->user_id,
        'subject' => $newData->subject,
        'message' => $newData->message,
    ]);
});

  FAILED  Tests\Feature\Pages\ContactUsPageTest > it can create                                                                         Error   
  Call to a member function getDefaultTestingSchemaName() on null

  at vendor/filament/forms/src/Testing/TestsForms.php:30
     26▕             if ($this->instance() instanceof HasActions) {
     27▕                 $form ??= $this->instance()->getMountedActionSchemaName();
     28▕             }
     29▕ 
  ➜  30▕             $form ??= $this->instance()->getDefaultTestingSchemaName();
     31▕ 
     32▕             /** @phpstan-ignore-next-line */
     33▕             $this->assertSchemaExists($form);
     34▕ 

      +3 vendor frames 
  4   tests/Feature/Pages/ContactUsPageTest.php:30