使用量角器2.1.0和CucumberJS時出錯

Question

從量角器2.0升級到量角器2.1時遇到問題，並懷疑這是使用量角器2.1和CucumberJS時的問題。當我編輯package.json降級到Protractor 2.0.0並重新安裝節點包時，問題就解決了。什麼原因導致了Protractor 2.1.0中的錯誤？我如何重寫我的項目以使用Protractor 2.1.0和Cucumber JS？

我的項目文件及其內容列舉如下：

/路徑/到/ myproject的/ conf.js

exports.config = { 
    sauceUser: process.env.SAUCE_USERNAME, 
    sauceKey: process.env.SAUCE_ACCESS_KEY, 
    specs: [ 
    'features/*.feature' 
    ], 
    multiCapabilities: [ 
    { 
     'browserName': 'chrome' 
    } 
    ], 
    framework: 'cucumber', 
    cucumberOpts: { 
    require: 'features/stepDefinitions.js', 
    format: 'summary' 
    } 
}; 

/路徑/到/ myproject的/ 功能/ demo.feature

Feature: Refund item 

    Scenario: Jeff returns a faulty microwave 
    Given Jeff has bought a microwave for $100 
    And he has a receipt 
    When he returns the microwave 
    Then Jeff should be refunded $100 

/路徑/到/ myproject的/ 特徵/ stepDefinitions.js

module.exports = function() { 
    this.Given(/^Jeff has bought a microwave for \$(\d+)$/, function (arg1, callback) { 
    // Write code here that turns the phrase above into concrete actions 
    callback.pending(); 
    }); 

    this.Given(/^he has a receipt$/, function (callback) { 
    // Write code here that turns the phrase above into concrete actions 
    callback.pending(); 
    }); 

    this.When(/^he returns the microwave$/, function (callback) { 
    // Write code here that turns the phrase above into concrete actions 
    callback.pending(); 
    }); 

    this.Then(/^Jeff should be refunded \$(\d+)$/, function (arg1, callback) { 
    // Write code here that turns the phrase above into concrete actions 
    callback.pending(); 
    }); 
}; 

/路徑/到/ myproject的/ 的package.json

{ 
    "name": "strato-remake", 
    "version": "1.0.0", 
    "description": "", 
    "main": "conf.js", 
    "dependencies": { 
    }, 
    "devDependencies": { 
    "cucumber": "0.4.9", 
    "protractor": "2.1.0" 
    }, 
    "scripts": { 
    "test": "echo \"Error: no test specified\" && exit 1" 
    }, 
    "author": "", 
    "license": "ISC" 
} 

當安裝該節點的包，和量角器運行：

$ npm install 
$ $(npm bin)/protractor conf.js 

以下錯誤是打印到終端：

Using SauceLabs selenium server at http://ondemand.saucelabs.com:80/wd/hub 
[launcher] Running 1 instances of WebDriver 
[launcher] Error: TypeError: Cannot read property 'apply' of undefined 
    at formatter.handleBeforeFeatureEvent (/path/to/myproject/node_modules/protractor/lib/frameworks/cucumber.js:83:41) 
    at /path/to/myproject/node_modules/protractor/lib/frameworks/cucumber.js:153:15 
    at Function.promise (/path/to/myproject/node_modules/protractor/node_modules/q/q.js:650:9) 
    at /path/to/myproject/node_modules/protractor/lib/frameworks/cucumber.js:147:14 
    at _fulfilled (/path/to/myproject/node_modules/protractor/node_modules/q/q.js:797:54) 
    at self.promiseDispatch.done (/path/to/myproject/node_modules/protractor/node_modules/q/q.js:826:30) 
    at Promise.promise.promiseDispatch (/path/to/myproject/node_modules/protractor/node_modules/q/q.js:759:13) 
    at /path/to/myproject/node_modules/protractor/node_modules/q/q.js:525:49 
    at flush (/path/to/myproject/node_modules/protractor/node_modules/q/q.js:108:17) 
    at process._tickCallback (node.js:355:11) 

[launcher] Process exited with error code 100 

但是，如果我編輯的package.json降級到2.0.0量角器，並重新安裝節點包：

"devDependencies": { 
    "cucumber": "0.4.9", 
    "protractor": "2.0.0" 
}, 

然後當我運行量角器工作：

$ $(npm bin)/protractor conf.js 

Using SauceLabs selenium server at http://ondemand.saucelabs.com:80/wd/hub 
[launcher] Running 1 instances of WebDriver 
1 scenario (1 pending) 
4 steps (1 pending, 3 skipped) 
SauceLabs results available at http://saucelabs.com/jobs/8a85b85e7a1c5dd344e694e392ec90c3 
[launcher] 0 instance(s) of WebDriver still running 
[launcher] chrome #1 passed 

如何我是否重寫這個項目以兼容Protractor 2.1.0和Cucumber JS？謝謝！

Answer 1

這是量角器中的一個錯誤的結果，該錯誤由this pull request修復。要使用特定的承諾，改變你的package.json包括：

"devDependencies": { 
    "cucumber": "0.4.9", 
    "protractor": "git+https://github.com/angular/protractor.git#0262268fa43b9eefac815d986740efa07bb15818" 
},