首页 > 解决方案 > afterAll ReferenceError 中抛出错误:未定义模块,nodejs 中的 Karma/Jasmine 测试错误

问题描述

我正在尝试使用 karma 和 jasmine 作为框架为 m nodejs 简单应用程序编写测试。我正在使用 karma-coverage 作为预处理器。这是项目的结构: 在此处输入图像描述

包.json

{
  "name": "tests",
  "version": "1.0.0",
  "description": "tests with karma in jasmine framework",
  "directories": {
    "test": "test"
  },
  "scripts": {
    "test": "karma start karma.conf.js"
  },
  "author": "",
  "license": "MIT",
  "devDependencies": {
    "jasmine-core": "^3.4.0",
    "karma": "^4.2.0",
    "karma-chrome-launcher": "^3.1.0",
    "karma-coverage": "^1.1.2",
    "karma-jasmine": "^2.0.1"
  }
}

业力.conf.js

// Karma configuration
// Generated on Sat Aug 17 2019 09:37:53 GMT+0500 (Uzbekistan Standard Time)

module.exports = function (config) {
    config.set({

        // base path that will be used to resolve all patterns (eg. files, exclude)
        basePath: '',


        // frameworks to use
        // available frameworks: https://npmjs.org/browse/keyword/karma-adapter
        frameworks: ['jasmine'],


        // list of files / patterns to load in the browser
        files: [
            'js/*.js',
            'test/*.test.js'
        ],


        // list of files / patterns to exclude
        exclude: [],


        // preprocess matching files before serving them to the browser
        // available preprocessors: https://npmjs.org/browse/keyword/karma-preprocessor
        preprocessors: {
            'test/*.test.js': ['coverage']
        },


        // test results reporter to use
        // possible values: 'dots', 'progress'
        // available reporters: https://npmjs.org/browse/keyword/karma-reporter
        reporters: ['progress', 'coverage'],


        // 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: ['Chrome'],


        // 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,

        // optionally, configure the reporter
        coverageReporter: {
            type: 'html',
            dir: 'coverage/'
        }
    })
}

每当我运行时npm test,我都会收到以下错误:

在此处输入图像描述

自定义 lodash.js

class CustomLodash {

    compact(array) {
        let newArray = [];
        for (let i = 0; i < array.length; i++) {
            if (!array[i] || array[i] === undefined || array[i] === null) {
                continue;
            }

            this.push(array[i])(newArray);
        }
        return newArray;
    }


}

let _ = new CustomLodash;

module.exports = {
    compact: _.compact
};

自定义 lodash.test.js

describe("CustomLodash", function () {

    let utils;
    //This will be called before running each spec
    beforeEach(function () {
        console.log('before each');
        utils = new CustomLodash();
    });


    describe("when calc is used to peform basic math operations", function () {
        it("creates an array with all falsey values removed", function () {
            // expect(utils.compact([0, 1, false, 2, '', 3])).toBe([1, 2, 3]);
            let compact = utils.compact([0, 1, false, 2, '', 3]);
            console.log('before each in it is: ', compact);
            expect(compact).toEqual([1, 2, 3]);
           //console.log('is defined ', expect(compact).toEqual([1, 2, 3]));
        });
    })


});

如您所见,console.log正在给出输出,这意味着正在读取文件。但是,当我打电话toBe()或者toEqual()我可以看到输出是未定义的(console.log也检查了这个)。非常感谢任何帮助。我搜索了很多答案和相关问题,但无法解决这个问题。

标签: javascriptjasminekarma-jasminekarma-coverage

解决方案


我想分享我对这个案例的解决方案。

添加 browserify 对我有用。另外,我添加了 watchify 来监视文件以进行增量编译。

Browserify 的诞生是为了在浏览器中制作你的 Node 代码。迄今为止,它仅支持 commons 的 node 风格(包括 JSON 支持),并为许多 node 核心模块提供内置的垫片。其他一切都是不同的包装。

以下是package.json添加包以在浏览器和 Node 中运行我的 ES6 代码后的样子:

"dependencies": {
    "browserify": "^16.2.3",
    "jasmine-core": "^3.2.1",
    "karma": "^4.2.0",
    "karma-chrome-launcher": "^3.1.0",
    "karma-browserify": "^5.3.0",
    "karma-commonjs": "^1.0.0",
    "karma-coverage": "^1.1.2",
    "karma-jasmine": "^2.0.1"
    "watchify": "^3.11.0"
  }

不要忘记在karma.config.js配置中添加 browserify,如下所示:

  • 将其添加到您的框架列表中

  • 将其添加到您的预处理器列表中。

例子:

preprocessors: {
      'src/**/*.js': ['coverage'],
      'js/**/*.js': ['browserify'],
      'test/**/*.[sS]pec.js': ['browserify']
    }

使用 ES6 可以通过构建来解决此类问题webpack,但browserify更可能以最少的配置工作,我选择在这种情况下使用它作为解决方案。希望它会帮助某人。


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