如何用量角器捕获AngularJS错误

当E2E使用Protractor测试AngularJS应用程序时,我遇到了一些问题.总结一下：我有以下规范,第一步总是因btstrpd错误而失败. (该页面是自动引导的,我们使用AngularJS v1.3.0和Protractor v2.1.0.)

@H_502_8@

describe('Protractor Demo App',function() {

    it('should have a title',function() {
        browser.get('http://myapp.abc.de/ext/#/login');
        expect(browser.getTitle()).toEqual('My App');
    });

    it('should do other stuff',function() {
        // ...
    });

});

错误：@H_502_8@

@H_502_8@

1) Protractor Demo App should have a title
 Message:
 UnknownError: unknown error: [ng:btstrpd] http://errors.angularjs.org/1.3.15/ng/btstrpd?p0=document
  (Session info: chrome=43.0.2357.132)
  (Driver info: chromedriver=2.15.322448 (52179c1b310fec1797c81ea9a20326839860b7d3),platform=Windows NT 6.1 SP1 x86_64) (WARNING: The server did not provide any stacktrace information)
Command duration or timeout: 9 milliseconds

(Full description here)@H_502_8@

由于我似乎没有找到防止此错误的解决方案,并且剩余的测试步骤没有任何问题,我的方法是简单地忽略错误.但是我不希望测试用例因此而失败.这让我想到了一个问题：如何捕获此错误以便测试不会失败？在步骤中的两个语句周围的简单try-catch不是技巧,因为我在这里没有任何承诺我也不能做一个典型的promise promise错误处理,因为人们会手动处理例如NoSuchElementError.@H_502_8@

编辑 – webdriver控制台中的错误：@H_502_8@

@H_502_8@

12:06:18.975 INFO - Executing: [new session: Capabilities [{count=1,browserName
=chrome}]])
12:06:18.995 INFO - Creating a new session for Capabilities [{count=1,browserNa
me=chrome}]
Starting ChromeDriver 2.15.322448 (52179c1b310fec1797c81ea9a20326839860b7d3) on
port 23267
Only local connections are allowed.
12:06:21.248 INFO - Done: [new session: Capabilities [{count=1,browserName=chro
me}]]
12:06:21.271 INFO - Executing: [set script timeoutt: 11000])
12:06:21.281 INFO - Done: [set script timeoutt: 11000]
12:06:21.390 INFO - Executing: [get: data:text/html,<html></html>])
12:06:21.405 INFO - Done: [get: data:text/html,<html></html>]
12:06:21.425 INFO - Executing: [execute script: window.name = "NG_DEFER_BOOTSTRA
P!" + window.name;window.location.replace("http://myapp.abc.de/ext/#/login");,[
]])
12:06:23.440 INFO - Done: [execute script: window.name = "NG_DEFER_BOOTSTRAP!" +
 window.name;window.location.replace("http://myapp.abc.de/ext/#/login");,[]]
12:06:23.458 INFO - Executing: [execute script: return window.location.href;,[]
])
12:06:23.468 INFO - Done: [execute script: return window.location.href;,[]]
12:06:23.489 INFO - Executing: [execute async script: try { return (function (at
tempts,asyncCallback) {
  var callback = function(args) {
    setTimeout(function() {
      asyncCallback(args);
    },0);
  };
  var check = function(n) {
    try {
      if (window.angular && window.angular.resumeBootstrap) {
        callback([true,null]);
      } else if (n < 1) {
        if (window.angular) {
          callback([false,'angular never provided resumeBootstrap']);
        } else {
          callback([false,'retries looking for angular exceeded']);
        }
      } else {
        window.setTimeout(function() {check(n - 1);},1000);
      }
    } catch (e) {
      callback([false,e]);
    }
  };
  check(attempts);
}).apply(this,arguments); }
catch(e) { throw (e instanceof Error) ? e : new Error(e); },[10]])
12:06:25.603 INFO - Done: [execute async script: try { return (function (attempt
s,[10]]
12:06:25.633 INFO - Executing: [execute script: return (function () {
    angular.module('protractorBaseModule_',[]).
        config(['$compileProvider',function($compileProvider) {
          if ($compileProvider.debugInfoEnabled) {
            $compileProvider.debugInfoEnabled(true);
          }
        }]);
  }).apply(null,arguments);,[]])
12:06:25.643 INFO - Done: [execute script: return (function () {
    angular.module('protractorBaseModule_',[]]
12:06:25.663 INFO - Executing: [execute script: angular.resumeBootstrap(argument
s[0]);,[[protractorBaseModule_]]])
12:06:26.093 WARN - Exception thrown
org.openqa.selenium.WebDriverException: unknown error: [ng:btstrpd] http://error
s.angularjs.org/1.3.15/ng/btstrpd?p0=document
  (Session info: chrome=43.0.2357.134)
  (Driver info: chromedriver=2.15.322448 (52179c1b310fec1797c81ea9a20326839860b7
d3),platform=Windows NT 6.1 SP1 x86_64) (WARNING: The server did not provide any
 stacktrace information)
Command duration or timeout: 10 milliseconds
Build info: version: '2.45.0',revision: '5017cb8',time: '2015-02-26 23:59:50'
System info: host: 'xxxxx',ip: 'xxx.xxx.xx.x',os.name: 'Windows 7',os.arch: '
amd64',os.version: '6.1',java.version: '1.8.0_45'
Driver info: org.openqa.selenium.chrome.ChromeDriver
Capabilities [{applicationCacheEnabled=false,rotatable=false,mobileEmulationEn
abled=false,chrome={userDataDir=C:\Users\abcdefg\AppData\Local\Temp\scoped_dir1
1436_18156},takesHeapSnapshot=true,databaseEnabled=false,handlesAlerts=true,version=43.0.2357.134,platform=XP,browserConnectionEnabled=false,nativeEvents
=true,acceptSslCerts=true,locationContextEnabled=true,webStorageEnabled=true,browserName=chrome,takesScreenshot=true,javascriptEnabled=true,cssSelectorsE
nabled=true}]
Session ID: 0c39849d960cccef7ec7036b8414c9fb
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

        at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)

        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Sou
rce)
        at java.lang.reflect.Constructor.newInstance(Unknown Source)
        at org.openqa.selenium.remote.ErrorHandler.createThrowable(ErrorHandler.
java:204)
        at org.openqa.selenium.remote.ErrorHandler.throwIfResponseFailed(ErrorHa
ndler.java:156)
        at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.ja
va:599)
        at org.openqa.selenium.remote.RemoteWebDriver.executeScript(RemoteWebDri
ver.java:508)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at org.openqa.selenium.support.events.EventFiringWebDriver$2.invoke(Even
tFiringWebDriver.java:101)
        at com.sun.proxy.$Proxy1.executeScript(Unknown Source)
        at org.openqa.selenium.support.events.EventFiringWebDriver.executeScript
(EventFiringWebDriver.java:213)
        at org.openqa.selenium.remote.server.handler.ExecuteScript.call(ExecuteS
cript.java:53)
        at java.util.concurrent.FutureTask.run(Unknown Source)
        at org.openqa.selenium.remote.server.DefaultSession$1.run(DefaultSession
.java:168)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
        at java.lang.Thread.run(Unknown Source)
12:06:26.103 WARN - Exception: unknown error: [ng:btstrpd] http://errors.angular
js.org/1.3.15/ng/btstrpd?p0=document
  (Session info: chrome=43.0.2357.134)
  (Driver info: chromedriver=2.15.322448 (52179c1b310fec1797c81ea9a20326839860b7
d3),time: '2015-02-26 23:59:50'
System info: host: 'xxxx',cssSelectorsE
nabled=true}]
Session ID: 0c39849d960cccef7ec7036b8414c9fb
12:06:26.203 INFO - Executing: [delete session: f947352d-3b40-4b1b-a46a-9d4ffe32
8b76])
12:06:27.417 INFO - Done: [delete session: f947352d-3b40-4b1b-a46a-9d4ffe328b76]

解决方法

在你的代码中,我会放一个WaitforAngular()以确保同步附加Angular&量角器.见以下参考：

@H_502_8@

it('should have a title',function() {
    browser.get('http://myapp.abc.de/ext/#/login');
    browser.waitForAngular();
    expect(browser.getTitle()).toEqual('My App');
});

然后,如果它不起作用,我会使用browser.pause();命令.这将破坏您使用该命令的量角器的执行.从那里你可以打开Chrome debuging控制台,看看究竟是什么.@H_502_8@

您还可以使用REPL debuging模式,这是检查页面上是否存在元素以及您使用正确选择器的非常方便的方法.@H_502_8@

有关使用量角器进行调试的更多信息,请参阅以下链接：https://angular.github.io/protractor/#/debugging@H_502_8@

如何用量角器捕获AngularJS错误

解决方法

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