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我有一个项目，它设置为使用和构建。使用它构建它可以正常工作node_modules/webpack/bin/webpack.js --config webpack.config.js，我可以在浏览器中毫无问题地运行结果。但是，当我npm test在浏览器中运行并查看测试运行程序时，出现错误："Uncaught ReferenceError: require is not defined at dashboard-tests.js:3". 似乎 webpack 正在将我的测试（但不是我的普通代码）编译成无法在浏览器中运行的

以下是相关文件：

.babelrc：

{
   "presets": ["es2015", "react"]
}

testem.json：

{
  "framework": [
    "jasmine"
  ],
  "launch_in_dev": [
    "PhantomJS"
  ],
  "launch_in_ci": [
    "PhantomJS"
  ],
  "serve_files": [
    "tmp/**/*-test{,s}.js"
  ],
  "on_start": "babel static_source --out-dir tmp",
  "on_exit": "yes | rm -r tmp"
}

包.json：

{
  "main": "index.js",
  "scripts": {
    "test": "testem"
  },
  "dependencies": {
    "jquery": "^3.2.1",
    "prop-types": "^15.6.0",
    "react": "^16.0.0",
    "react-dom": "^16.0.0",
    "react-feather": "^1.0.7"
  },
  "devDependencies": {
    "babel-cli": "^6.26.0",
    "babel-core": "^6.26.0",
    "babel-loader": "^7.1.2",
    "babel-preset-env": "^1.6.1",
    "babel-preset-react": "^6.24.1",
    "jasmine-es6": "^0.4.3",
    "testem": "^1.18.4",
    "webpack": "^3.6.0"
  }
}

webpack.config.js：

var path = require("path");
var webpack = require('webpack');

module.exports = {
  context: __dirname,
  entry: './static_source/js/index.js', 
  output: {
    path: path.resolve('./app/static/js/'),
    filename: "compiled.js"
  },
  plugins: [],
  module: {
    loaders: [
      { test: /\.js$/, loader: 'babel-loader', exclude: /node_modules/ },
      { test: /\.jsx$/, loader: 'babel-loader', exclude: /node_modules/ }
    ],
  }
}

仪表板测试：

import React from 'react';
import ReactDOM from "react-dom";
import TestUtils from "react-dom/test-utils";

import Dashboard from './dashboard';

describe('Dashboard', function() {
  it('exists', function() {
    expect(Dashboard).not.toBe(undefined);
  });

  it('renders arrows', function() {
    var dashboard = <Dashboard />;
    var renderedDashboard = TestUtils.renderIntoDocument(dashboard);

    var arrowsDiv = TestUtils.findRenderedComponentWithClass('arrows');

    expect(arrowsDiv).not.toBe(undefined);
  });
});
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1 回答 1

1

你正在使用 Babel 来编译你的测试源文件。Babel 只是一个转译器，它接收 ES+ 文件并将它们转换为 ES5 文件。因为import在 ES5 中不存在 Babel 将它们替换为require().

要解决此问题，您需要使用 Webpack 将源文件捆绑为一个。

您将需要一个单独的 Webpack 配置文件，我们称之为webpack.config.test.js. 在这个文件中，我们需要指示 Webpack 获取所有static_source/**/*-test{,s}.js文件作为入口点。您将需要该glob模块：npm install glob --save-dev. 然后添加webpack.config.test.js具有此内容的文件：

var path = require("path");
var glob = require('glob');
var webpack = require('webpack');

module.exports = {
  context: __dirname,
  // we look for all file ending with -test(s?).js and return the absolute path
  entry: glob
      .sync('./static_source/js/**/*-test{,s}.js')
      .map(function(file) { return path.resolve(__dirname, file) }),
  output: {
    // save the resulting bundle in the ./tmp/ directory
    path: path.resolve('./tmp/'),
    filename: "compiled.js"
  },
  plugins: [],
  module: {
    loaders: [
      { test: /\.js$/, loader: 'babel-loader', exclude: /node_modules/ },
      { test: /\.jsx$/, loader: 'babel-loader', exclude: /node_modules/ }
    ],
  }
}

在testem.json文件上将 替换on_start为before_testWebpack，并将serve_files映射到捆绑文件。

"before_tests": "webpack --config webpack.config.test.js ",
"serve_files": [
    "tmp/compiled.js"
],

什么时候testem启动它会触发 Webpack 测试编译。现在您应该有一个tmp/compiled.js包含所有测试文件的文件。您可能需要进行一些调整，但它应该基本上可以工作。

于 2017-11-17T22:21:12.067 回答