node的自动化测试 - node | ay = ay的博客 = ay的博客

Node 有有一个内置的测试库 node:test
测试执行命令： npm script test
编写测试脚本让命令更简洁：

并创建一个 .test.js 文件，内容类似于：

	const { test } = require('node:test')
	const assert = require('node:assert') // 引入断言库

	const reverse = require('../utils/for_testing').reverse

	test('reverse of a', () => {
	const result = reverse('a')

	assert.strictEqual(result, 'a') // 断言是否全等
	})

	test('reverse of react', () => {
	const result = reverse('react')

	assert.strictEqual(result, 'tcaer')
	})

	test('reverse of saippuakauppias', () => {
	const result = reverse('saippuakauppias')

	assert.strictEqual(result, 'saippuakauppias')
	})

随后我们就可以通过命令 npm test 进行测试，这个命令会自动的找到 .test.js 文件进行测试
对于测试文件，我们也可以通过 describe 来对测试进行分组，这样我们就可以更好的对测试进行分类

	const { test, describe } = require('node:test')

	// ...

	const average = require('../utils/for_testing').average

	describe('average', () => {
	test('of one value is the value itself', () => {
	assert.strictEqual(average([1]), 1)
	})

	test('of many is calculated right', () => {
	assert.strictEqual(average([1, 2, 3, 4, 5, 6]), 3.5)
	})

	test('of empty array is zero', () => {
	assert.strictEqual(average([]), 0)
	})
	})

让我们对博客列表应用添加新功能

	const mostBlogs = (blogs) => {
	const authors = blogs.reduce((acc, blog) => {
	if (acc[blog.author]) {
	acc[blog.author] += 1;
	} else {
	acc[blog.author] = 1;
	}
	return acc;
	}, {});
	return Object.keys(authors).reduce((acc, author) => {
	if (authors[author] > acc.blogs) {
	return {author: author, blogs: authors[author]};
	}
	return acc;
	}, {author: '', blogs: 0});
	}

	describe('most blogs', () => {
	test('the author with most blogs', () => {
	const result = listHelper.mostBlogs(blogs)
	assert.deepStrictEqual(result, { author: 'Robert C. Martin', blogs: 3 })
	})
	})

得到的结果将会是