如何为单个 JS 文件编写单元测试? [英] How do I write unit tests for a single JS file?

问题描述

我有一个 js 文件，里面有一个函数.我想为该函数编写单元测试并将测试和文件交付给某人.它需要是独立的.

I have a single js file with a function in in. I want to write unit tests for the function and deliver the tests and file to someone. It needs to be standalone.

这是我的项目:

src: myFunction.js
tests: empty for now

myFunction.js:

myFunction.js:

function HelloWord() {
   return 'Hello';
}

如果有这样的测试文件就好了:

It would be great to have a test file like this:

import { func } from './myFunction.js';

describe('tests', function () {
    it('returns hello', function () {
        expect(func()).toEqual('Hello');
    });
});

我不知道哪种单元测试框架最容易和最快地完成我需要做的事情.用户需要获取我的目录并从命令行运行测试.

I don't know which unit test framework would be the easiest and fastest to accomplish what I need to do. The user needs to get my directory and just run the tests from the command line.

推荐答案

使用 Mocha，一个非常快速的设置是:

Using Mocha, a really fast set up would be:

1) 将 mocha 安装到 package.json:

1) Install mocha to package.json:

npm install --save-dev mocha

2) 写下测试.让它成为 /tests/ 下的 test.js ，例如:

2)Write down the test. Let it be test.js under /tests/ , for example:

var myFunc = require('./myFunction');

var assert = require('assert');
describe('the function' , function(){
    it('works' , function(){
        assert.equal( myFunc() , 'hello');
    });
});

3) 设置package.json 测试命令:

3) Set up the package.json test command:

{
    ...
    "scripts": {
        "test": "node_modules/mocha/bin/mocha tests/test.js"
    }
}

4) 通过 npm test 调用测试.

4) Call tests by npm test.

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