[Cart Operations] Update Cart Items Mutation

[pmclain]

Description (*)

Mutation for updating cart items.

#37

Manual testing scenarios (*)

1. Create empty cart

mutation {
  createEmptyCart
}

2. Add product to cart

mutation AddToCart($cartId: String!) {
  addSimpleProductsToCart(input: {
    cart_id:$cartId
    cartItems:[
      {
        data: {
          sku:"product_dynamic_1",
          qty:2
        }
      }
      {
        data: {
          sku:"product_dynamic_2",
          qty:2
        }
      }
    ]
  }) {
    cart {
      cart_id
      items {
        id
        qty
        product {
          sku
        }
      }
    }
  }
}

3. Update cart items

mutation updateCart($cartId:String!, $itemId:String!) {
  updateCartItems(input:{
    cart_id:$cartId
    cart_items:[
      {
        item_id:"$itemId"
        qty: 5
      }
    ]
  }) {
    cart {
      cart_id
      items {
        id
        qty
        product {
          sku
        }
      }
    }
  }
}

4. Validate item quantity has been updated
5. Remove cart item via zero qty update

mutation updateCart($cartId:String!, $itemId:String!) {
  updateCartItems(input:{
    cart_id:$cartId
    cart_items:[
      {
        item_id:"$itemId"
        qty: 0
      }
    ]
  }) {
    cart {
      cart_id
      items {
        id
        qty
        product {
          sku
        }
      }
    }
  }
}

6. Validate cart item is removed

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)

[TomashKhamlai]

Similar problem like in #357 can be seen here while updating with qty = -1
Validation message is expected

message: "Please enter a quantity greater than 0."

Do not think that it should be fixed here or now. Just linking issue to have use cases to check later
@naydav, can you approve that "zero qty update" is valid request?

[TomashKhamlai]

Covered mc-8886

[naydav]

Similar problem like in #357 can be seen here while updating with qty = -1
Validation message is expected

message: "Please enter a quantity greater than 0."

Do not think that it should be fixed here or now. Just linking issue to have use cases to check later
@naydav, can you approve that "zero qty update" is valid request?

Need to ask PO

[ghost]

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[keharper]

Documented as part of magento/devdocs#4502