使用Karma运行的Mocha单元测试 - done（）未定义 [英] Mocha unit tests running with Karma - done() is not defined

问题描述

我正在尝试用Mocha编写的测试来运行Karma，它们有点工作，但是我不能使用done（）方法来实现异步测试，这实际上使得这些工具对我来说毫无用处。我缺少什么？

I'm trying to get tests written with Mocha to work running Karma, and they sort of work, but I cannot use the done() method to implement async tests, which essentially makes the tools useless to me. What am I missing?

karma.conf.js

karma.conf.js

module.exports = function(config) {
  config.set({
    basePath: '../..',
    frameworks: ['mocha', 'requirejs', 'qunit'],
    client: {
        mocha: {
            ui: 'bdd'
        }
    },
    files: [
      {pattern: 'libs/**/*.js', included: false},
      {pattern: 'src/**/*.js', included: false},
      {pattern: 'tests/mocha/mocha.js', included: false},
      {pattern: 'tests/should/should.js', included: false},
      {pattern: 'tests/**/*Spec.js', included: false},
      'tests/karma/test-main.js'
    ],
    exclude: [
      'src/main.js'
    ],
    // test results reporter to use
    // possible values: 'dots', 'progress', 'junit', 'growl', 'coverage'
    reporters: ['progress', 'dots'],
    port: 9876,
    colors: true,
    // possible values: config.LOG_DISABLE || config.LOG_ERROR || config.LOG_WARN || config.LOG_INFO || config.LOG_DEBUG
    logLevel: config.LOG_WARN,
    autoWatch: true,
    // Start these browsers, currently available:
    // - Chrome
    // - ChromeCanary
    // - Firefox
    // - Opera (has to be installed with `npm install karma-opera-launcher`)
    // - Safari (only Mac; has to be installed with `npm install karma-safari-launcher`)
    // - PhantomJS
    // - IE (only Windows; has to be installed with `npm install karma-ie-launcher`)
    browsers: ['Chrome'],
    // If browser does not capture in given timeout [ms], kill it
    captureTimeout: 60000,
    // Continuous Integration mode
    // if true, it capture browsers, run tests and exit
    singleRun: false
  });
};

test-main.js（配置RequireJS）

test-main.js (configuring RequireJS)

var allTestFiles = [];
var pathToModule = function(path) {
  return path.replace(/^\/base\//, '../').replace(/\.js$/, '');
};

Object.keys(window.__karma__.files).forEach(function(file) {
  if (/Spec\.js$/.test(file)) {
    // Normalize paths to RequireJS module names.
    allTestFiles.push(pathToModule(file));
  }
});

require.config({
  // Karma serves files under /base, which is the basePath from your config file
  baseUrl: '/base/src',
  paths: {
    'should': '../tests/should/should',
    'mocha': '../tests/mocha/mocha',
    'pubsub': '../libs/pubsub/pubsub',
    'jquery': '../libs/jquery/jquery-1.10.2',
    'jquery-mobile': '//code.jquery.com/mobile/1.4.2/jquery.mobile-1.4.2.min'
  },
  // dynamically load all test files
  deps: allTestFiles, 
  // we have to kickoff jasmine, as it is asynchronous
  callback: window.__karma__.start
});

tests / fooSpec.js

tests/fooSpec.js

define(['music/note'], function(Note) {

describe('nothing', function(done) {
    it('a silly test', function() {
        var note = new Note;
        note.should.not.eql(32);
    });
    done();
});
...

虽然这是一个人为的例子但它成功了如果我删除了done（）调用。实际上，我得到：

Though this is a contrived example, it succeeds if I remove the done() call. As it is, I get:

Uncaught TypeError: undefined is not a function
at /Library/WebServer/Documents/vg/tests/mocha/fooSpec.js:8

这是done（）行。如何/为什么没有定义？我不知道在哪里配置Mocha（或使用什么选项）。是否有某种全局命名空间或元编程魔法导致RequireJS干扰Mocha？

This is the done() line. How/why is this not defined? I'm not understanding where else to configure Mocha (or with what options). Is there some sort of global namespace or meta-programming magic causing RequireJS to interfere with Mocha?

我在OS X 10.9.2上运行Chrome 33中的测试，如果完全相关的话。我已经杀了一个大量的时间，并准备放弃自动化测试:( - 有类似的砖墙与QUnit / Karma / RequireJS，并没有找到任何替代成功自动化测试。我觉得自己像个白痴。

I'm running the tests in Chrome 33 on OS X 10.9.2, in case that is at all relevant. I've killed a ton of time on this and am ready to give up on automated testing :( -- had similar brick walls with QUnit/Karma/RequireJS and have not been able to find any alternative to successfully automate tests. I feel like an idiot.

推荐答案

在Mocha中，已完成回调适用于 ，之前的，之后的， beforeEach ， afterEach 。所以：

In Mocha, the done callback is for it, before, after, beforeEach, afterEach. So:

describe('nothing', function() {
    it('a silly test', function(done) {
        var note = new Note;
        note.should.not.eql(32);
        done();
    });
});

这是 doc 。

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