Code style

tests/Stubs/Models/UserWithCustomOptimusConnection.php

@@ -24,6 +24,6 @@ public function nestedUsers(): HasMany
 
     public function parentUser(): BelongsTo
     {
-        return$this->belongsTo(UserWithCustomOptimusConnection::class, 'parent_id');
+        return $this->belongsTo(UserWithCustomOptimusConnection::class, 'parent_id');
     }
 }

tests/Stubs/Models/UserWithDefaultOptimusConnection.php

@@ -22,6 +22,6 @@ public function nestedUsers(): HasMany
 
     public function parentUser(): BelongsTo
     {
-        return$this->belongsTo(UserWithDefaultOptimusConnection::class, 'parent_id');
+        return $this->belongsTo(UserWithDefaultOptimusConnection::class, 'parent_id');
     }
 }

tests/Traits/OptimusEncodedRouteKeyTest.php

@@ -28,7 +28,7 @@ protected function setUp(): void
         parent::setUp();
 
         $this->loadLaravelMigrations(config('database.default'));
-        $this->loadMigrationsFrom(__DIR__.'/../Stubs/Migrations');
+        $this->loadMigrationsFrom(__DIR__.'/../database/migrations');
         $this->configurePrimeNumbers();
     }
 
@@ -185,13 +185,13 @@ public function testExistingIntegerValuesBelow256AreResolved()
      *
      * @return \Cog\Tests\Laravel\Optimus\Stubs\Models\UserWithDefaultOptimusConnection
      */
-    protected function createUserWithDefaultOptimusConnection(array $data = []): UserWithDefaultOptimusConnection
+    protected function createUserWithDefaultOptimusConnection(array $attributes = []): UserWithDefaultOptimusConnection
     {
         return UserWithDefaultOptimusConnection::create(array_merge([
             'name' => 'Default Test User',
             'email' => 'test@user.com',
             'password' => 'p4ssw0rd',
-        ], $data));
+        ], $attributes));
     }
 
     /**

tests/database/migrations/2023_09_07_173419_add_parent_id_to_users_table.php

@@ -0,0 +1,22 @@
+<?php
+
+declare(strict_types=1);
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::table('users', function (Blueprint $table) {
+            $table->foreignId('parent_id')->nullable();
+        });
+    }
+
+    public function down(): void
+    {
+        throw new \Exception('Migration is irreversible');
+    }
+};