[Cart Operations] Remove item mutation

[pmclain]

Description (*)

Mutation for deleting 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. Delete item from cart

mutation RemoveFromCart($cartId: String!, $itemId: String!) {
  removeItemFromCart(input: {
    cart_id:$cartId
    cart_item_id:$itemId
  }) {
    cart {
      cart_id
      items {
        id
        qty
        product {
          sku
        }
      }
    }
  }
}

4. Validate deleted item is no longer present in response

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)

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[keharper]

Documented as part of magento/devdocs#4502