feat(mail): implement MailService for tenant-specific SMTP configuration and update MailTestService to utilize it

tests/Feature/MailTest/MailTestControllerTest.php

@@ -4,6 +4,8 @@ namespace Tests\Feature\MailTest;
 
 use App\Domains\Attachable\Enums\AttachmentType;
 use App\Domains\Attachable\Models\Attachment;
+use App\Domains\Integration\Models\Integration;
+use App\Domains\Integration\Models\TenantIntegration;
 use App\Domains\MailTest\Mailables\TestMail;
 use App\Domains\Tenant\Models\Tenant;
 use Illuminate\Foundation\Testing\RefreshDatabase;
@@ -55,6 +57,36 @@ class MailTestControllerTest extends TestCase
         });
     }
 
+    public function test_it_uses_the_tenant_email_integration_when_configured(): void
+    {
+        Mail::fake();
+        $tenant = $this->createTenant();
+
+        Integration::create([
+            'integration_code' => 'email',
+            'name' => 'Email',
+        ]);
+        TenantIntegration::create([
+            'tenant_code' => $tenant->codigo,
+            'integration_code' => 'email',
+            'integration_data' => [
+                'MAIL_SCHEME' => 'smtp',
+                'MAIL_HOST' => 'smtp.example.com',
+                'MAIL_PORT' => 587,
+                'MAIL_USERNAME' => 'mailer@example.com',
+                'MAIL_PASSWORD' => 'secret',
+                'MAIL_FROM_ADDRESS' => 'store@example.com',
+            ],
+        ]);
+
+        $this->postJson('/api/acme/mail-test/send', [
+            'to' => 'recipient@example.com',
+        ])->assertOk()
+            ->assertJsonPath('mailer', 'tenant-smtp');
+
+        Mail::assertSent(TestMail::class);
+    }
+
     public function test_it_validates_the_recipient(): void
     {
         Mail::fake();