Fix coupon enum formatting in Filament table

tests/Unit/CouponsTableTest.php

@@ -0,0 +1,19 @@
+<?php
+
+namespace Tests\Unit;
+
+use App\Enums\CouponStatus;
+use App\Enums\CouponType;
+use App\Filament\Resources\Coupons\Tables\CouponsTable;
+use Tests\TestCase;
+
+class CouponsTableTest extends TestCase
+{
+    public function test_it_formats_enum_states(): void
+    {
+        $this->assertSame(CouponType::FLAT->label(), CouponsTable::formatEnumState(CouponType::FLAT));
+        $this->assertSame(CouponStatus::PAUSED->label(), CouponsTable::formatEnumState(CouponStatus::PAUSED));
+        $this->assertSame('Flat Per Seat', CouponsTable::formatEnumState('flat_per_seat'));
+        $this->assertSame('', CouponsTable::formatEnumState(null));
+    }
+}