feat: Add event association to purchases; implement event relationship in models, update migration, and enhance tests

tests/Unit/Forms/SaleFormServiceTest.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace Tests\Unit\Forms;
+
+use App\Domains\Forms\Services\SaleFormService;
+use App\Domains\Purchase\Models\Purchase;
+use PHPUnit\Framework\TestCase;
+
+class SaleFormServiceTest extends TestCase
+{
+    public function test_it_returns_every_purchase_status_as_a_form_option(): void
+    {
+        $form = (new SaleFormService)->get();
+
+        $this->assertSame(Purchase::statuses(), array_column($form['statuses'], 'code'));
+        $this->assertSame([
+            'Creada',
+            'Esperando pago',
+            'Confirmada',
+            'Cancelada',
+            'Rechazada',
+            'Vencida',
+        ], array_column($form['statuses'], 'name'));
+    }
+}