Question

为什么我使用Protractor API函数时会收到错误？我已经在网上搜索了这个问题的解决方案，我找到了几个类似的答案，但是他们没有工作，所以我问社区。

我正在尝试使用Karma和Protractor设置最简单的e2e测试。像这样的空块测试代码不会产生错误：

describe('Mapping Assistant State', () => {
   beforeEach(() => {
   });

   it('should display a table',() => {
      console.log('test');
   });

   it('should click the create Paste button',() => {

    });
});

一旦我从量角器添加某些函数，例如expect（）或browser（），就会出现问题：

it('should display a table',() => {
    browser.get('someUrl');
    expect(element(by.css('.map')).getText()).toContain('map');

});

以下是我的package.json的一些内容：

"protractor": "^5.3.0",
"karma": "^1.7.1",
"@angular/cli": "^1.6.6",
"typescript": "^2.5.2"
"@angular/core": "^4.3.6",
"rxjs": "^5.4.3",
"@types/selenium-webdriver": "^3.0.6",
"ts-node": "^4.0.1",
"@types/node": "^8.0.58",

此外：

import { browser, by, element } from 'protractor';
import {describe} from 'selenium-webdriver/testing';
import {beforeEach} from 'selenium-webdriver/testing';

这是我的protractor.conf.js文件：

const { SpecReporter } = require('jasmine-spec-reporter');

exports.config = {
    allScriptsTimeout: 11000,
    specs: [
        './e2e/**/*.e2e-spec.ts'
    ],
    capabilities: {
        'browserName': 'chrome'
    },
    directConnect: true,
    baseUrl: 'http://localhost:4200/',
    framework: 'jasmine',
    jasmineNodeOpts: {
        showColors: true,
        defaultTimeoutInterval: 30000,
        print: function() {}
    },
    onPrepare() {
        require('ts-node').register({
            project: 'e2e/tsconfig.e2e.json'
        });
        jasmine.getEnv().addReporter(new SpecReporter({ spec: { displayStacktrace: true } }));
    }
};

添加任何量角器功能并运行“测试”后，会出现以下错误：

    ERROR in ./node_modules/saucelabs/index.js
Module not found: Error: Can't resolve './lib-cov/SauceLabs' in '/Users/moop/Work/frontend/web/node_modules/saucelabs'
 @ ./node_modules/saucelabs/index.js 2:2-32
 @ ./node_modules/protractor/built/driverProviders/sauce.js
 @ ./node_modules/protractor/built/driverProviders/index.js
 @ ./node_modules/protractor/built/runner.js
 @ ./node_modules/protractor/built/index.js
 @ ./e2e/sample.e2e-spec.ts
 @ ./src/test.ts

ERROR in ./node_modules/protractor/built/runner.js
Module not found: Error: Can't resolve 'child_process' in '/Users/moop/Work/frontend/web/node_modules/protractor/built'
 @ ./node_modules/protractor/built/runner.js 54:32-56
 @ ./node_modules/protractor/built/index.js
 @ ./e2e/sample.e2e-spec.ts
 @ ./src/test.ts

ERROR in ./node_modules/protractor/built/bpRunner.js
Module not found: Error: Can't resolve 'child_process' in '/Users/moop/Work/frontend/web/node_modules/protractor/built'
 @ ./node_modules/protractor/built/bpRunner.js 3:24-48
 @ ./node_modules/protractor/built/driverProviders/driverProvider.js
 @ ./node_modules/protractor/built/driverProviders/index.js
 @ ./node_modules/protractor/built/runner.js
 @ ./node_modules/protractor/built/index.js
 @ ./e2e/sample.e2e-spec.ts
 @ ./src/test.ts

ERROR in ./node_modules/protractor/built/debugger.js
Module not found: Error: Can't resolve 'child_process' in '/Users/moop/Work/frontend/web/node_modules/protractor/built'
 @ ./node_modules/protractor/built/debugger.js 67:32-56
 @ ./node_modules/protractor/built/browser.js
 @ ./node_modules/protractor/built/index.js
 @ ./e2e/sample.e2e-spec.ts
 @ ./src/test.ts

ERROR in ./node_modules/selenium-webdriver/firefox/binary.js
Module not found: Error: Can't resolve 'child_process' in '/Users/moop/Work/frontend/web/node_modules/selenium-webdriver/firefox'
 @ ./node_modules/selenium-webdriver/firefox/binary.js 25:14-38
 @ ./node_modules/selenium-webdriver/firefox/index.js
 @ ./node_modules/protractor/built/index.js
 @ ./e2e/sample.e2e-spec.ts
 @ ./src/test.ts

ERROR in ./node_modules/selenium-webdriver/io/exec.js
Module not found: Error: Can't resolve 'child_process' in '/Users/moop/Work/frontend/web/node_modules/selenium-webdriver/io'
 @ ./node_modules/selenium-webdriver/io/exec.js 20:21-45
 @ ./node_modules/selenium-webdriver/remote/index.js
 @ ./node_modules/protractor/built/index.js
 @ ./e2e/sample.e2e-spec.ts
 @ ./src/test.t

有没有人知道造成这种情况的原因以及如何解决这个问题？

Answer 1

请仔细检查您的日志

日志-
./node_modules/saucelabs/index.js中的错误找不到模块：错误：无法解析“ N：\ Angular Codes \ billmanagement \ node_modules \ saucelabs ”中的“ ./lib-cov/SauceLabs”
./node_modules/protractor/built/runner.js中的错误找不到模块：错误：无法解析“ N：\ Angular Codes \ billmanagement \ node_modules \ 量角器 \ built'

中的“ child_process”

解决方案-
确保在app.module.ts中已导入正确版本的事件发射器
从'@ angular / core'导入{EventEmitter};

不（通常是Visual Studio自动执行）从“量角器”导入{EventEmitter}；

Answer 2

再安装两个包：<input type="text" class="input-text hasDatepicker" name="wc_order_field_2563" id="wc_order_field_2563" placeholder="Click here to choose your pickup date*: (Tuesday - Saturday)" value="">和@types/node

Answer 3

在我的情况下，偶然从保护器而不是jquery导入了$

Answer 4

如果使用的是编辑器（例如VSCode），则自动导入将产生此问题。除了上面的答案，即表明了这一点：

import { EventEmitter } from 'protractor';

代替这个...

import { EventEmitter } from '@angular/core';

会给您所说的错误。但是，即使这样：

import { error } from 'protractor';

代替这个...

import { error} from '@angular/core';

也会给您相同的结果。就我而言，我不需要导入！我试图在catch语句中使用临时变量名称“错误”，并且在键入该名称时会自动从量角器创建导入。（我现在决定使用更具体的名称，例如“ myfuncerr”）。因此，任何自动完成功能都可能会从错误的库中导入。

如果遇到此错误，首先要做的是对“量角器”一词进行全局查找。这是一个快速解决方案（它将为我节省至少几个小时）。

某些量角器API函数会导致错误

4 个答案: