math.js (failing test)

math.js

exports.add = function (x, y) {
  return x + y;
}

exports.sub = function (x, y) {
  return x - y;
}

exports.sumOfPositiveNumbers = function (upperLimitInclusive) {
  let result = 0;
  for (let i = 1; i < upperLimitInclusive; i++) {
    result += i;
  }
  return result;
}