add all controllers logic

tests/Unit/Services/Phone/PhoneFormatterServiceTest.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace Tests\Unit\Services\Phone;
+
+use App\Services\Phone\PhoneFormatterService;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\TestCase;
+
+class PhoneFormatterServiceTest extends TestCase
+{
+    use RefreshDatabase;
+
+    public function test_format_returns_null_for_invalid(): void
+    {
+        $service = app(PhoneFormatterService::class);
+
+        $this->assertNull($service->format('123'));
+    }
+
+    public function test_format_formats_digits(): void
+    {
+        $service = app(PhoneFormatterService::class);
+
+        $this->assertSame('555-123-4567', $service->format('(555) 123-4567'));
+    }
+}