Protractor helper function: Click option[index] of select element

ptor.click.option.js

       /**
       * Click option[index] of select element
       * @param select
       * @param index
       * @returns {protractor.promise}
       */
        function clickOption(select, index) {
        var deferred = protractor.promise.defer();
        select.click().then(function () {
          var options = select.all(by.css('option'));
          expect(options.count()).toBeGreaterThan(index);
          expect(options.get(index).getText()).toBeDefined();
          options.get(index).click().then(function () {
            select.click();
            browser.waitForAngular().then(deferred.fulfill, deferred.reject);
          }, deferred.reject);
        }, deferred.reject);
        return deferred.promise;
      }

Usage example:

    var select = element.all(by.css('[ng-model="data.app.class_of_trade"] select')).first();
    yourHelpersObject.clickOption(select, 1).then(function () {
      // here will be your code of expectations, this code is just for example
      expect(element.all(by.css('.pc-field-error:not(.ng-hide)')).count()).toEqual(0);
      expect(element.all(by.css('.input-label.assertive')).count()).toEqual(0);
    });