feat(tests): remove CustomBaseModelTest

This commit deletes the CustomBaseModelTest class, which contained tests for cache invalidation on save and delete actions for the Creation model.

tests/Feature/Model/CustomBaseModelTest.php

-<?php
-
-namespace Tests\Feature\Model;
-
-use App\Models\Creation;
-use Illuminate\Foundation\Testing\RefreshDatabase;
-use Illuminate\Support\Facades\Cache;
-use Tests\TestCase;
-
-class CustomBaseModelTest extends TestCase
-{
-    use RefreshDatabase;
-
-    public function test_cache_is_invalidated_on_save()
-    {
-        $model = Creation::factory()->create();
-        $originalSlug = $model->slug;
-
-        Cache::shouldReceive('forget')
-            ->once()
-            ->with(Creation::class);
-
-        $model->slug = 'new-slug';
-        $model->save();
-
-        $this->assertNotEquals($originalSlug, $model->fresh()->slug);
-        $this->assertEquals('new-slug', $model->fresh()->slug);
-    }
-
-    public function test_cache_is_invalidated_on_delete()
-    {
-        $model = Creation::factory()->create();
-        Cache::shouldReceive('forget')
-            ->once()
-            ->with(Creation::class);
-        $model->delete();
-    }
-
-    public function test_cache_is_not_invalidated_if_no_save()
-    {
-        $model = Creation::factory()->create();
-        Cache::shouldReceive('forget')
-            ->never();
-        $model->slug = 'new-slug';
-    }
-}