量角器黄瓜BDD测试在执行前显示通过 [英] Protractor Cucumber BDD Tests Show Pass before Execution

问题描述

我使用Protractor with Cucumber进行了BDD测试。在执行代码时，控制台立即显示传递的结果，并且代码实际上仅在此之后开始执行。

I have a sample BDD test using Protractor with Cucumber. On executing the code, the console immediately shows the result as passed and the code actually begins executing only after that.

我希望执行状态显示与实际执行同步。（例如控制台显示 - '鉴于我启动量角器演示页'并执行下面的代码，然后控制台显示下一步等等）我知道它与Async编码有关回调，但无法弄清楚确切的问题。

I wish execution status display to be in sync with actual execution.(e.g Console displays - 'Given I launch the protractor demo page' and the code underneath is executed, then console displays next step and so on) I know it has got something to do with Async coding and callbacks, not able to figure out the exact problem though.

功能文件：

Feature: Test
Scenario:  Test Scenario
    Given I launch the protractor demo page
    When I enter two in the first field
    And I enter three in the second field
    And I click Go button
    Then Result should be displayed as Five

步骤文件：

 var chai = require('chai');
    var chaiAsPromised = require('chai-as-promised');
    chai.use(chaiAsPromised);
    var expect = chai.expect;

    module.exports = function () {


        this.Given(/^I launch the protractor demo page$/, function (callback) {
            browser.driver.manage().window().maximize();
            browser.get('http://juliemr.github.io/protractor-demo/');

            browser.getTitle().then(function(text){
               console.log('title is - ' + text);
                expect(text).to.equal('Super Calculator');
            });
         callback();
        });

        this.When(/^I enter two in the first field$/, function (callback) {
            element(by.model('first')).sendKeys('2');
            callback();
        });

        this.When(/^I enter three in the second field$/, function (callback) {
            element(by.model('second')).sendKeys('3');
            callback();
        });

        this.When(/^I click Go button$/, function (callback) {
            element(by.id('gobutton')).click();
            callback();
        });

        this.Then(/^Result should be displayed as Five$/, function (callback) {
             element(by.repeater('result in memory')).all(by.tagName('td')).get(2).getText().then(function(text){
            expect(text).to.equal('5');
            });
            callback();
        });

    };

推荐答案

你需要要么返回承诺或在步骤定义中使用 done 回调。否则，黄瓜不知道您的异步
操作何时完成。

You need to either return a promise or use the done callback in your step definitions. Otherwise cucumber doesn't know when your asynchronous actions are complete.

我有同样的问题，上面的陈述是来自量角器的核心成员之一的回复 - 黄瓜 github论坛。

I had the same question and above statement was the response from one of the core members of the protractor-cucumber github forum.

当我执行某些动作时，我更喜欢返回承诺结果用 .then 函数并使用 .done 回调函数当我没有时，你也不需要回调现在 CucumberJS 支持承诺。所以你的步骤文件看起来应该是 -

I prefer to return promises when I am performing some actions on the results with .then function and use .done callback function when I am not, Also you don't need callbacks now CucumberJS supports promises. So your step file should look like -

var chai = require('chai');
var chaiAsPromised = require('chai-as-promised');
chai.use(chaiAsPromised);
var expect = chai.expect;

module.exports = function () {


    this.Given(/^I launch the protractor demo page$/, function () {
        browser.driver.manage().window().maximize();
        browser.get('http://juliemr.github.io/protractor-demo/');

      return browser.getTitle().then(function(text){
           console.log('title is - ' + text);
            expect(text).to.equal('Super Calculator');
        });
    });

    this.When(/^I enter two in the first field$/, function () {
       return element(by.model('first')).sendKeys('2'); 
    });

    this.When(/^I enter three in the second field$/, function () {
       return element(by.model('second')).sendKeys('3'); // you can use return also
    });

    this.When(/^I click Go button$/, function () {
        return element(by.id('gobutton')).click();
    });

    this.Then(/^Result should be displayed as Five$/, function () {
        return element(by.repeater('result in memory')).all(by.tagName('td')).get(2).getText().then(function(text){
        expect(text).to.equal('5');
        });

    });

};

我建议你阅读承诺 http://www.html5rocks.com/en/tutorials/es6/promises/因为它需要了解他们的行为方式。他们有时候会很棘手，我花了一段时间才能得到一个想法，我还有很多需要学习的东西：）

I would recommend you to read about Promises http://www.html5rocks.com/en/tutorials/es6/promises/ as it requires some understanding how they behave.They can be sometimes tricky, it took me a while to get an idea still I have lot to learn :)

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