test: add validation tests for insufficient stock on purchase and order operations

tests/Feature/Admin/Manage/OrderTest.php

@@ -213,6 +213,65 @@
             ->assertJsonValidationErrors(['customer_name', 'items']);
     });
 
+    it('returns flash error when stock is insufficient on order store', function () {
+        $product = Product::factory()->create(['stock' => 1]);
+
+        $data = [
+            'customer_name' => 'John Doe',
+            'subtotal' => 20000,
+            'discount' => 0,
+            'payment' => 20000,
+            'payment_method' => PaymentMethod::CASH->value,
+            'order_status' => OrderStatus::PENDING->value,
+            'order_channel' => OrderChannel::STORE->value,
+            'items' => [
+                [
+                    'product_id' => $product->id,
+                    'qty' => 5, // lebih dari stok
+                    'price' => 10000,
+                    'total' => 50000,
+                    'price_type' => PriceType::RETAIL->value,
+                ],
+            ],
+        ];
+
+        postJson(route('order.store'), $data)
+            ->assertRedirect()
+            ->assertSessionHas('error');
+
+        expect($product->fresh()->stock)->toBe(1);
+    });
+
+    it('returns flash error when stock is insufficient on order update', function () {
+        $product = Product::factory()->create(['stock' => 2]);
+        $order = Order::factory()->create();
+
+        $newData = [
+            'customer_name' => 'Updated Customer',
+            'subtotal' => 30000,
+            'discount' => 0,
+            'payment' => 30000,
+            'payment_method' => PaymentMethod::CASH->value,
+            'order_status' => OrderStatus::PROCESSING->value,
+            'order_channel' => OrderChannel::STORE->value,
+            'items' => [
+                [
+                    'product_id' => $product->id,
+                    'qty' => 10, // lebih dari stok
+                    'price' => 3000,
+                    'total' => 30000,
+                    'price_type' => PriceType::RETAIL->value,
+                ],
+            ],
+        ];
+
+        patchJson(route('order.update', $order), $newData)
+            ->assertRedirect()
+            ->assertSessionHas('error');
+
+        expect($product->fresh()->stock)->toBe(2);
+    });
+
     it('can update an order', function () {
         $product1 = Product::factory()->create(['stock' => 10]);
         $product2 = Product::factory()->create(['stock' => 10]);

tests/Feature/Admin/Manage/PurchaseTest.php

@@ -139,6 +139,61 @@
             ->assertJsonValidationErrors(['purchase_date', 'items']);
     });
 
+    it('returns flash error when stock is insufficient on purchase update', function () {
+        $product = Product::factory()->create(['stock' => 0]);
+
+        $purchase = Purchase::create([
+            'purchase_date' => now()->format('Y-m-d'),
+            'note' => 'Old Note',
+            'total' => 5000,
+        ]);
+
+        $purchase->items()->create([
+            'user_id' => auth()->id(),
+            'product_id' => $product->id,
+            'quantity' => 5,
+            'unit_price' => 1000,
+            'total_price' => 5000,
+        ]);
+
+        $newData = [
+            'purchase_date' => now()->format('Y-m-d'),
+            'note' => 'Updated Note',
+            'items' => [
+                [
+                    'product_id' => $product->id,
+                    'quantity' => 10,
+                    'unit_price' => 2000,
+                ],
+            ],
+        ];
+
+        patchJson(route('purchase.update', $purchase), $newData)
+            ->assertRedirect()
+            ->assertSessionHas('error');
+
+        expect($purchase->fresh()->note)->toBe('Old Note');
+    });
+
+    it('returns flash error when stock is insufficient on purchase delete', function () {
+        $product = Product::factory()->create(['stock' => 0]);
+        $purchase = Purchase::factory()->create();
+
+        $purchase->items()->create([
+            'user_id' => auth()->id(),
+            'product_id' => $product->id,
+            'quantity' => 5,
+            'unit_price' => 1000,
+            'total_price' => 5000,
+        ]);
+
+        deleteJson(route('purchase.destroy', $purchase))
+            ->assertRedirect()
+            ->assertSessionHas('error');
+
+        expect(Purchase::find($purchase->id))->not->toBeNull();
+    });
+
     it('can access purchase edit page', function () {
         $purchase = Purchase::factory()->create();