ENGCOM-4575: While adding the product to Cart when the requested Qty is zero or less then zero, one was unexpectedly added #487

Author: naydav

app/code/Magento/QuoteGraphQl/Model/Cart/AddSimpleProductToCart.php

@@ -67,6 +67,11 @@ public function execute(Quote $cart, array $cartItemData): void
     {
         $sku = $this->extractSku($cartItemData);
         $qty = $this->extractQty($cartItemData);
+        if ($qty <= 0) {
+            throw new GraphQlInputException(
+                __('Please enter a number greater than 0 in this field.')
+            );
+        }
         $customizableOptions = $this->extractCustomizableOptions($cartItemData);
 
         try {

dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/AddSimpleProductToCartTest.php

@@ -59,6 +59,22 @@ public function testAddSimpleProductToCart()
         self::assertEquals($sku, $response['addSimpleProductsToCart']['cart']['items'][0]['product']['sku']);
     }
 
+    /**
+     * @magentoApiDataFixture Magento/Catalog/_files/products.php
+     * @magentoApiDataFixture Magento/Checkout/_files/active_quote.php
+     * @expectedException \Exception
+     * @expectedExceptionMessage Please enter a number greater than 0 in this field.
+     */
+    public function testAddSimpleProductToCartWithNegativeQty()
+    {
+        $sku = 'simple';
+        $qty = -2;
+        $maskedQuoteId = $this->getMaskedQuoteId();
+
+        $query = $this->getAddSimpleProductQuery($maskedQuoteId, $sku, $qty);
+        $this->graphQlQuery($query);
+    }
+
     /**
      * @return string
      */