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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?

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. 我有一个带功能的js文件。我想为该功能编写单元测试,并将测试和文件交付给某人。 It needs to be standalone. 它必须是独立的。

Here is my project: 这是我的项目:

src: myFunction.js
tests: empty for now

myFunction.js: myFunction.js:

function HelloWord() {
   return 'Hello';
}

It would be great to have a test file like this: 拥有这样的测试文件将是很棒的:

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

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

I don't know which unit test framework would be the easiest and fastest to accomplish what I need to do. 我不知道哪种单元测试框架最容易,最快地完成我需要做的事情。 The user needs to get my directory and just run the tests from the command line. 用户需要获取我的目录,然后仅从命令行运行测试。

Using Mocha, a really fast set up would be: 使用Mocha,一个真正快速的设置将是:

1) Install mocha to package.json: 1)将mocha安装到package.json:

npm install --save-dev mocha

2)Write down the test. 2)写下测试内容。 Let it be test.js under /tests/ , for example: 使其成为/tests/下的test.js ,例如:

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

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

3) Set up the package.json test command: 3)设置package.json测试命令:

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

4) Call tests by npm test . 4)通过npm test调用测试。

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