ZoneAwarePromise已被重写

Question

在将应用程序升级到rc-7并运行我的单元测试以确保没有发生故障后，我在大约一半的单元测试上得到了这条错误消息。

“错误: Zone.js检测到ZoneAwarePromise‘’(窗口为全局的).Promise‘已被覆盖。最有可能的原因是在Zone.js之后加载了一个承诺的填充(在加载zone.js时，没有必要加载它。如果您必须加载一个，那么在加载zone.js之前，在节点_modules/zone.js/dist/zone.js(第21行)中加载它)。”

我能想到的最接近的事情是，我通过手动返回可观察值来模拟来自单元测试中http调用的响应。

这是一个使用Jasmine和Karma进行单元测试的Angular2应用程序。

更新，因此，根据错误消息，这似乎是一个加载顺序问题，但是，我不会在我可以确定的任何地方加载填充，除非我意外地抓住了它们。我附加了我的karma.conf.js和systemjs.conf.js，以帮助查找错误。

Karma.conf.js

module.exports = function(config) {
  var gulpConfig = require('../gulp/config')();

  /**
   * List of npm packages that imported via `import` syntax
   */
  var dependencies = [
    '@angular',
    'lodash',
    'rxjs'
  ];

  var configuration = {
    basePath: '../../',

    browserNoActivityTimeout: 20000,
    frameworks: ['jasmine'],
    browsers: ['PhantomJS'],
    reporters: ['progress', 'coverage'],

    preprocessors: {},

    // Generate json used for remap-istanbul
    coverageReporter: {
      includeAllSources: true,
      dir: 'coverage/appCoverage/remap/',
      reporters: [
        { type: 'json', subdir: 'report-json' }
      ]
    },

    files: [
      'node_modules/reflect-metadata/Reflect.js',
      'node_modules/zone.js/dist/zone.js',
      'node_modules/zone.js/dist/long-stack-trace-zone.js',
      'node_modules/zone.js/dist/proxy.js',
      'node_modules/zone.js/dist/sync-test.js',
      'node_modules/zone.js/dist/jasmine-patch.js',
      'node_modules/zone.js/dist/async-test.js',
      'node_modules/zone.js/dist/fake-async-test.js',

      'node_modules/angular/angular.js',
      'node_modules/core-js/client/shim.min.js',
      'node_modules/systemjs/dist/system.src.js'
    ],

    // proxied base paths
    proxies: {
      // required for component assests fetched by Angular's compiler
      "/src/": "/base/src/",
      "/app/": "/base/src/app/",
      "/node_modules/": "/base/node_modules/"
    },

    port: 9876,
    colors: true,
    logLevel: config.LOG_INFO,
    autoWatch: true,
    //browserNoActivityTimeout: 100000
  };

  configuration.preprocessors[gulpConfig.tmpApp + '**/!(*.spec)+(.js)'] = ['coverage'];
  configuration.preprocessors[gulpConfig.tmpApp + '**/*.js'] = ['sourcemap'];
  configuration.preprocessors[gulpConfig.tmpTest + '**/*.js'] = ['sourcemap'];

  var files = [
    gulpConfig.tmpTest + 'test-helpers/global/**/*.js',
    gulpConfig.src + 'systemjs.conf.js',
    'config/test/karma-test-shim.js',
    createFilePattern(gulpConfig.tmpApp + '**/*.js', { included: false }),
    createFilePattern(gulpConfig.tmpTest + 'test-helpers/*.js', { included: false }),
    createFilePattern(gulpConfig.app + '**/*.html', { included: false }),
    createFilePattern(gulpConfig.app + '**/*.css', { included: false }),
    createFilePattern(gulpConfig.app + '**/*.ts', { included: false, watched: false }),
    createFilePattern(gulpConfig.tmpApp + '**/*.js.map', { included: false, watched: false })
  ];

  configuration.files = configuration.files.concat(files);

  dependencies.forEach(function(key) {
    configuration.files.push({
        pattern: 'node_modules/' + key + '/**/*.js',
        included: false,
        watched: false
    });
  });

  if (process.env.APPVEYOR) {
    configuration.browsers = ['IE'];
    configuration.singleRun = true;
    configuration.browserNoActivityTimeout = 90000; // Note: default value (10000) is not enough
  }

  config.set(configuration);

  // Helpers
  function createFilePattern(path, config) {
    config.pattern = path;
    return config;
  }
}

UPDATE我的解决方案包括确保所有的zone.js文件都是在karma.conf.js中最后加载的。我猜我还包括了一些其他的内容，也包括了多边形填充，但是是在zone.js之后加载的，因此出现了错误。在把zone.js移到最后之后，一切都很好。

Answer 1

我也遇到了同样的问题。(角2 RC.7茉莉花)这是由于我在我的karma.conf.js.中加载测试文件的命令。我在/zone.js/dist/zone.js之前装载/systemjs/dist/system-polyfills.js.在systemjs填充解决了这个问题之后，更改文件的顺序来加载zone.js。

下面是我在karma.conf.js中的当前设置，它解决了我的错误。

files: [
  {pattern: 'dist/vendor/es6-shim/es6-shim.js', included: true, watched: false},
  {pattern: 'dist/vendor/reflect-metadata/Reflect.js', included: true, watched: false},
  {pattern: 'dist/vendor/systemjs/dist/system-polyfills.js', included: true, watched: false},
  {pattern: 'dist/vendor/systemjs/dist/system.src.js', included: true, watched: false},
  {pattern: 'dist/vendor/zone.js/dist/zone.js', included: true, watched: false},
  {pattern: 'dist/vendor/zone.js/dist/proxy.js', included: true, watched: false},
  {pattern: 'dist/vendor/zone.js/dist/sync-test.js', included: true, watched: false},
  {pattern: 'dist/vendor/zone.js/dist/long-stack-trace-zone.js', included: true, watched: false},
  {pattern: 'dist/vendor/zone.js/dist/async-test.js', included: true, watched: false},
  {pattern: 'dist/vendor/zone.js/dist/fake-async-test.js', included: true, watched: false},
  {pattern: 'dist/vendor/zone.js/dist/jasmine-patch.js', included: true, watched: false},

  {pattern: 'config/karma-test-shim.js', included: true, watched: true},

  // Distribution folder.
  {pattern: 'dist/**/*', included: false, watched: true}
],

Answer 2

在zone.js之前，我还必须包括ES6-承诺。HTH。

Answer 3

如果有人犯了和我一样愚蠢的错误的话，那就补充一下我的经验吧。使用ng，我在.angular-cli.json的scripts部分中有以下内容

...
"scripts": [
    "../node_modules/bootstrap/dist/js/bootstrap.min.js",
    "../node_modules/core-js/client/shim.min.js"
],
...

我甚至不记得，为什么我把shim.min.js放在第一位。但是无论如何，在移除它之后，我的测试用例现在运行得完美无缺：

...
"scripts": [
    "../node_modules/bootstrap/dist/js/bootstrap.min.js"
],
...