Added test

Signed-off-by: snipe <snipe@snipe.net>

tests/Feature/Manufacturers/Ui/IndexManufacturersTest.php

@@ -2,6 +2,7 @@
 
 namespace Tests\Feature\Manufacturers\Ui;
 
+use App\Models\Manufacturer;
 use App\Models\User;
 use Tests\TestCase;
 
@@ -13,4 +14,15 @@ class IndexManufacturersTest extends TestCase
             ->get(route('manufacturers.index'))
             ->assertOk();
     }
+
+    public function testCannotSeedIfManufacturersExist()
+    {
+        Manufacturer::factory()->create();
+
+        $this->actingAs(User::factory()->superuser()->create())
+            ->post(route('manufacturers.seed'))
+            ->assertStatus(302)
+            ->assertSessionHas('error')
+            ->assertRedirect(route('manufacturers.index'));
+    }
 }