exports.assertion = function elementCount (selector, count) {
  this.message = `Testing if element <${selector}> has count: ${count}`
  this.expected = count
  this.pass = val => val === count
  this.value = res => res.value
  function evaluator (_selector) {
    return document.querySelectorAll(_selector).length
  }
  this.command = cb => this.api.execute(evaluator, [selector], cb)
}