// A custom Nightwatch assertion.
  // The assertion name is the filename.
  // Example usage:
  //
  //   browser.assert.elementCount(selector, count)
  //
  // For more information on custom assertions see:
  // http://nightwatchjs.org/guide#writing-custom-assertions
  
  exports.assertion = function (selector, count) {
    this.message = 'Testing if element <' + selector + '> has count: ' + count
    this.expected = count
    this.pass = function (val) {
      return val === this.expected
    }
    this.value = function (res) {
      return res.value
    }
    this.command = function (cb) {
      var self = this
      return this.api.execute(function (selector) {
        return document.querySelectorAll(selector).length
      }, [selector], function (res) {
        cb.call(self, res)
      })
    }
  }