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const quantityInput = document.getElementsByClassName('product-quantity-input')[0];
const unitPriceElement = document.getElementsByClassName('unit-price item')[0].getElementsByClassName('value')[0];
const totalPriceElement = document.getElementsByClassName('subtotal item')[0].getElementsByClassName('value')[0];
const setQty = val => {
  const e = document.createEvent('HTMLEvents');
  e.initEvent('change', false, false);
  quantityInput.dispatchEvent(e);
  quantityInput.value = val;
}
const currUnitPrice = () => Number(unitPriceElement.textContent.replace("$", "")) || 0;
const currTotalPrice = () => Number(totalPriceElement.textContent.replace("$", "")) || 0;
const NUMBER_RANGE = [...Array(2976).keys()];

const getNewPriceMap = x =>
  new Promise(resolve => {
    setQty(x + 25);
    setTimeout(() => {
      resolve({ [currUnitPrice()]: currTotalPrice() })
    }, 20000)
  });

async function allPrices() {
  return NUMBER_RANGE.map(getNewPriceMap);
}