expect/modules/arrayContains.js

Write better assertions

/**
 * Returns true if the given array contains the value, false
 * otherwise. The comparator function must return false to
 * indicate a non-match.
 */
function arrayContains(array, value, comparator) {
  if (comparator == null)
    return array.indexOf(value) !== -1

  return array.some(function (item) {
    return comparator(item, value) !== false
  })
}

export default arrayContains