user affiliation schema completed

backend/tests/Feature/Models/UserTest.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace Tests\Feature\Models;
+
+use App\Models\User;
+use App\Models\UserAffiliation;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\TestCase;
+
+class UserTest extends TestCase
+{
+    use RefreshDatabase;
+
+    public function test_it_has_many_affiliations(): void
+    {
+        $user = User::factory()->create();
+        UserAffiliation::factory()->create(['user_id' => $user->id]);
+
+        $this->assertCount(1, $user->refresh()->affiliations);
+    }
+}