feat: add OtpCodeFactory and comprehensive tests for AuthService and RegistrationService

database/factories/OtpCodeFactory.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace Database\Factories;
+
+use Illuminate\Database\Eloquent\Factories\Factory;
+
+/**
+ * @extends \Illuminate\Database\Eloquent\Factories\Factory<\App\Models\OtpCode>
+ */
+class OtpCodeFactory extends Factory
+{
+    public function definition(): array
+    {
+        return [
+            'phone' => '09' . fake()->numerify('#########'),
+            'code' => (string) fake()->numberBetween(1000, 9999),
+            'expires_at' => now()->addMinutes(3),
+        ];
+    }
+
+    public function expired(): static
+    {
+        return $this->state(fn (array $attributes) => [
+            'expires_at' => now()->subMinute(),
+        ]);
+    }
+}