带有 Webpack 和 Typescript 的 Karma 不执行任何测试

Question

我正在尝试弄清楚如何将 Karma 测试运行程序与 Webpack 和 Typescript 源文件一起使用。以这个源文件作为唯一的测试文件为例：

test.spec.ts

var message: string = 'yay';
alert(message);
describe('1st tests', () => {
  it('true is true', () => expect(true).toBe(true));
});

以及以下业力配置：

karma.config.js

module.exports = function (config) {

  config.set({
    basePath: '',
    frameworks: ['jasmine'],

    plugins: [
      require('karma-jasmine'),
      require('karma-chrome-launcher'),
      require('karma-webpack'),
      require('karma-jasmine-html-reporter')
    ],

    client: {
      builtPaths: ['app/'], // add more spec base paths as needed
      clearContext: false // leave Jasmine Spec Runner output visible in browser
    },

    customLaunchers: {
      // From the CLI. Not used here but interesting
      // chrome setup for travis CI using chromium
      Chrome_travis_ci: {
        base: 'Chrome',
        flags: ['--no-sandbox']
      }
    },

    files: [
      { pattern: 'app/test.spec.ts', included: true, watched: true },
    ],

    exclude: [],
    preprocessors: {
      // add webpack as preprocessor
      'app/test.spec.ts': ['webpack']
    },

    webpack: {
      // karma watches the test entry points
      // (you don't need to specify the entry option)
      // webpack watches dependencies

      // webpack configuration
      resolve: {
        //root: [ path.join(__dirname, 'app') ],
        extensions: ['', '.ts', '.js']
      },
      module: {
        loaders: [
          // .ts files for TypeScript
          { test: /\.ts$/, loaders: ['awesome-typescript-loader', 'angular2-template-loader'], exclude: '/node_modules/' },
        ]
      }
    },
    reporters: ['progress', 'kjhtml'],

    port: 9876,
    colors: true,
    logLevel: config.LOG_INFO,
    autoWatch: true,
    browsers: ['Chrome'],
    singleRun: false
  })
}

运行karma start 时未找到任何测试。浏览器将启动，但它说它找到了 0 个测试。当我将 .ts 扩展名更改为 .js 并更新 karma 配置文件时，它确实可以工作，所以很明显是 Typescript 搞砸了。

但是，当使用上面的配置手动运行 webpack 时，它只会输出一个正确的 javascript 文件，所以配置看起来确实没问题...

完整地说，这些是package.json 和tsconfig.json 文件：

package.json

{
  "name": "karma-test",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "karma": "karma init"
  },
  "author": "",
  "license": "ISC",
  "private": true,
  "devDependencies": {
    "@types/jasmine": "^2.5.41",
    "angular2-template-loader": "^0.6.0",
    "awesome-typescript-loader": "^3.0.0-beta.18",
    "jasmine-core": "^2.5.2",
    "karma": "^1.4.0",
    "karma-chrome-launcher": "^2.0.0",
    "karma-jasmine": "^1.1.0",
    "karma-jasmine-html-reporter": "^0.2.2",
    "karma-webpack": "^2.0.1",
    "typescript": "^2.1.5",
    "webpack": "^1.14.0"
  }
}

tsconfig.json

{
    "compileOnSave": false,
    "compilerOptions": {
        "target": "es5",
        "module": "commonjs",
        "moduleResolution": "node",
        "sourceMap": true,
        "emitDecoratorMetadata": true,
        "experimentalDecorators": true,
        "removeComments": false,
        "noImplicitAny": true,
        "suppressImplicitAnyIndexErrors": true
    },
    "awesomeTypescriptLoaderOptions": {
        "useWebpackText": true
    },
    "exclude": [
        "node_modules"
    ]
}

Answer 1

我也遇到过这个问题。我最终切换到karma-typescript，它可以完美地运行测试。

Answer 2

您必须为 Typescript 文件添加 mime 类型。否则，Chrome 将不会运行这些文件。

mime: {
  'text/x-typescript': ['ts']
}