clickDropdownOptionWithGivenValue.js

var TestTools = {

  // some other helpers
  // ...

  clickDropdownOptionWithGivenValue: function (
    selectId, optionValue) {
    element(by.css('#' + selectId)).click();
    return element(
      by.xpath(
        '//select[@id="' + selectId + 
        '"]/option[text()="' + optionValue  + '"]')
    ).click();
  }
};

// some other exports
// ...
module.exports.clickDropdownOptionWithGivenValue = TestTools.clickDropdownOptionWithGivenValue;