当使用ES2015 / React预设到Babel时,Testem接收编译为`require`的导入

时间:2017-11-14 21:27:11

标签: javascript babel testem

我设置了一个项目,以便使用进行构建。使用node_modules/webpack/bin/webpack.js --config webpack.config.js构建它可以正常工作,我可以在浏览器中运行结果,没有任何问题。但是,当我运行npm test并在浏览器中查看测试运行器时,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)编译成一个无法在浏览器中运行的版本。

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"
}

的package.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);
  });
});

1 个答案:

答案 0 :(得分:1)

您正在使用Babel编译测试源文件。 Babel只是一个转换器,它需要ES +文件并将它们转换为ES5文件。由于ES5中不存在import,因此Babel将其替换为require()

要解决此问题,您需要使用Webpack 源文件捆绑到一个

您需要一个单独的Webpack配置文件,我们称之为webpack.config.test.js。在此文件中,我们需要指示Webpack将所有static_source/**/*-test{,s}.js文件作为入口点获取。 您需要glob模块:npm install glob --save-dev。 然后使用以下内容添加webpack.config.test.js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/ }
    ],
  }
}

testem.json文件上将on_start替换为before_test替换为Webpack,将serve_files替换为映射到捆绑文件。

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

testem启动时,它将触发Webpack测试编译。 现在您应该有一个tmp/compiled.js文件,其中包含所有测试文件。你可能需要做一些调整,但基本上应该有效。