While adding the product to Cart when the requested Qty is zero or less then zero, one was unexpectedly added

[TomashKhamlai]

Preconditions (*)

1. Add configurable product to Cart #224 or Add virtual products to cart #320 is merged or [Cart Operations] Add configurable product to Cart #142 is fixed (if not need to work create a new branch based on 142_Add_configurable_product_to_Cart, not 2.3-develop)

Steps to reproduce (*)

1. Create any Product from Storefront with qty 1000 and Stock Status IN_STOCK. For example:

Key	Value	Value
PRODUCT TYPE	SIMPLE	VIRTUAL
Name	Simple Product	Virtual Product
SKU	simple-product	virtual-product
Price	10	10
qty	1000	1000
Tax Group	Taxable Goods	Taxable Goods
Stock Status	IN_STOCK	IN_STOCK
Weight	1	1

2. Create an empty Cart from Storefront or using GraphQL API.
3. Get the Masked Quote Id
4. Perform GraphQL request:

mutation {
  addSimpleProductsToCart(
    input: {
      cart_id: "BVbiFodiH2s8m0HOcLvrUAKzpEJuvzHQ"
      cartItems: [{
        data: {
          sku: "simple-product"
          qty: 0
        } 
      }{
        data: {
          sku: "virtual-product"
          qty: 0
        }
      }
      ]
    }
  ) {
    cart {
      items {
        qty
        ... on SimpleCartItem {
          product {
            type_id
            name
            sku
            price {
              regularPrice {
                amount {
                  value
                }
              }
            }
            stock_status
          }
        }
        ... on VirtualCartItem {
          product{
            type_id
            name
            sku
            price {
              regularPrice {
                amount {
                  value
                }
              }
            }
            stock_status
          }
        }
      }
    }
  }
}

Expected result (*)

1. message: "Please enter a quantity greater than 0." or at least qty in the Cart doesn't change after request

Actual result (*)

1. Qty is increasing by one after every request

[naydav]

@TomashKhamlai
Please, recheck this bug on latest 2.3-developer branch
Thanks

[XxXgeoXxX]

Hi, everyone
I reproduced this bug. It happens because Magento recheck input value by knokout(uses class 'validate-greater-than-zero':true).

[naydav]

#487