Angular 2用webpack测试karma时，无法找到变量:Map

Angular 2 testing karma with webpack Can't find variable: Map

本文关键字：变量 Map webpack 测试 karma Angular      更新时间：2023-09-26

我正在尝试用karma和webpack测试我的指令。这是karma配置文件

module.exports = function (config) {
    config.set({
        basePath: './',
        frameworks: ["jasmine"],
        files: [
            {
            pattern: 'directive.spec.ts',
            watched: false
        }],
        exclude: [],
        preprocessors: {
            'directive.spec.ts': ['webpack', 'sourcemap']
        },
        webpackServer: {
            noInfo: true
        },
        port: 9876,
        colors: true,
        logLevel: config.LOG_INFO,
        autoWatch: false,
        browsers: [
            "PhantomJS"
        ],
        singleRun: true,
        reporters: ['mocha'],
        webpack: {
            resolve: {
                extensions: ['', '.ts', '.js'],
                modulesDirectories: ['node_modules', '.'],
            },
            module: {
                loaders: [{
                    test: /'.ts$/,
                    loader: 'awesome-typescript-loader'
                }]
            },
            stats: {
                colors: true,
                reasons: true
            },
            debug: true,
            devtool: 'inline-source-map'
        }
    });
};

和指令。spec.ts:

import { MyDirective } from './directive';
import {TestComponent} from './test';
import {
  async,
  inject,
  TestBed,
} from '@angular/core/testing';
describe('TestComponent', () => {
  let fixture: any;
beforeEach(() => {
  fixture = TestBed.configureTestingModule({
    declarations: [ TestComponent, MyDirective]
  })
  .createComponent(TestComponent);
  fixture.detectChanges();
});
  it('should work', () => {
    expect(true).toBe(true);
  });

但是当我试图运行我的测试时，我得到这个错误:

PhantomJS 2.1.1 (Mac OS X 0.0.0) ERROR ReferenceError: Can't find

我在这里错过了什么?

请按照以下步骤操作。

1)用以下代码创建一个"karma-main.js"文件

require('core-js/es6');
require('core-js/es7/reflect');
require('zone.js/dist/zone');
require('zone.js/dist/long-stack-trace-zone');
require('zone.js/dist/proxy');
require('zone.js/dist/sync-test');
require('zone.js/dist/jasmine-patch');
require('zone.js/dist/async-test');
require('zone.js/dist/fake-async-test');
var appContext = require.context('<Source code root folder>', true, /'.spec'.ts/); // Assuming test case files ends with spec.ts
appContext.keys().forEach(appContext);
var testing = require('@angular/core/testing');
var browser = require('@angular/platform-browser-dynamic/testing');
testing.TestBed.initTestEnvironment(browser.BrowserDynamicTestingModule, browser.platformBrowserDynamicTesting());

2)你的karma.conf.js文件看起来应该像 

var webpackConfig = require('./webpack.config')
module.exports = function(config) {
  config.set({
    // base path that will be used to resolve all patterns (eg. files, exclude)
    basePath: '',
    plugins: [
      'karma-jasmine',
      'karma-PhantomJS-launcher',
      'karma-webpack'
    ],
    webpack: webpackConfig,
    // frameworks to use
    // available frameworks: https://npmjs.org/browse/keyword/karma-adapter
    frameworks: ['jasmine'],
    // list of files / patterns to load in the browser
    files: [
      { pattern: '<relative path to karma-main.js>', watched: false }
    ],
    // list of files to exclude
    exclude: [
    ],
    // preprocess matching files before serving them to the browser
    // available preprocessors: https://npmjs.org/browse/keyword/karma-preprocessor
    preprocessors: {
      '<relative path to karma-main.js>': ['webpack']
    },
    // test results reporter to use
    // possible values: 'dots', 'progress'
    // available reporters: https://npmjs.org/browse/keyword/karma-reporter
    reporters: ['progress'],
    // web server port
    port: 9876,
    // enable / disable colors in the output (reporters and logs)
    colors: true,
    // level of logging
    // possible values: config.LOG_DISABLE || config.LOG_ERROR || config.LOG_WARN || config.LOG_INFO || config.LOG_DEBUG
    logLevel: config.LOG_INFO,
    // enable / disable watching file and executing tests whenever any file changes
    autoWatch: true,
    // start these browsers
    // available browser launchers: https://npmjs.org/browse/keyword/karma-launcher
    browsers: ['PhantomJS'],
    // Continuous Integration mode
    // if true, Karma captures browsers, runs the tests and exits
    singleRun: false,
    // Concurrency level
    // how many browser should be started simultaneous
    concurrency: Infinity
  })
}

这是我的猜测:在代码的某个地方，您使用了ES6中出现的类Map。但是PhantomJS还不知道这个类，因为它太新了。

所以有3个选择:

  • 放弃使用Map，只使用当前的JS特性(如对象属性)-最干净的方法。
  • 使用转译器将你的ES6代码转换成现代浏览器可以很好地理解的ES5。这有很大的缺点，因为它会弄乱你的行号，你可能不得不牺牲调试一些代码的可能性。
  • 使用实现ES6特性的多边形作为外部库中的函数(如Sachin Gaur建议的)
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