Question

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。我错过了什么？

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）

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
});

测试/ 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，如果我删除done（）调用它会成功。事实上，我得到了：

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）。是否存在某种全局命名空间或元编程魔法导致RequireJS干扰Mocha？

我在OS X 10.9.2上的Chrome 33中运行测试，如果完全相关的话。我已经花了很多时间在这上面并准备放弃自动化测试:( - 有类似的砖墙与QUnit / Karma / RequireJS，并且无法找到任何替代成功自动化测试。我感觉像白痴。

Answer 1

在Mocha中，done回调适用于it，before，after，beforeEach，afterEach。所以：

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

这是doc。

Answer 2

神圣％$＃@！

我不会在一百万年后认为这会是barf：

describe('nothing', function(done) {
    it('umm...', function() {
        var note = new Note;
        note.should.not.eql(32);
    });
    done(); // throws error that undefined is not a function
});

但这很好用：

describe('nothing', function(done) {
    it('umm...', function() {
        var note = new Note;
        note.should.not.eql(32);
    });
    setTimeout(function() {
        done();  // MAGIC == EVIL.
    }, 1000);
});

Answer 3

您在该示例中运行的测试不需要done（）回调。它不是异步的。需要完成回调的示例....

describe('Note', function() {
    it('can be retrieved from database', function(done) {
        var note = new Note();
        cb = function(){
           note.contents.should.eql("stuff retrieved from database");
           done()
        }
        //cb is passed into the async function to be called when it's finished
        note.retrieveFromDatabaseAsync(cb)
    });
});

您的测试不应该进行完成回调

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

});

只有＆＃39;它＆＃39; function提供完成回调。描述没有。你的问题不在于业力。您的mocha测试未正确定义。

使用Karma运行的Mocha单元测试 - done（）未定义

3 个答案: