From 8590ca23b3440b2ef2d72ecabdbb2c403075332b Mon Sep 17 00:00:00 2001
From: huxiguo <hu@seekhoo.cn>
Date: Thu, 9 Nov 2023 22:45:37 +0800
Subject: [PATCH] jest02

---
 docs/.vuepress/dist                           |   2 +-
 ...25\345\205\203\346\265\213\350\257\225.md" | 232 ++++++++++++++++++
 2 files changed, 233 insertions(+), 1 deletion(-)

diff --git a/docs/.vuepress/dist b/docs/.vuepress/dist
index d10d495d..96c34956 160000
--- a/docs/.vuepress/dist
+++ b/docs/.vuepress/dist
@@ -1 +1 @@
-Subproject commit d10d495d3014461fb297006b1161e4dc3d63bff6
+Subproject commit 96c34956837d5656ab28469ecb5da10811c7fcf1
diff --git "a/docs/testing/\345\215\225\345\205\203\346\265\213\350\257\225.md" "b/docs/testing/\345\215\225\345\205\203\346\265\213\350\257\225.md"
index 644ee767..3c55da0d 100644
--- "a/docs/testing/\345\215\225\345\205\203\346\265\213\350\257\225.md"
+++ "b/docs/testing/\345\215\225\345\205\203\346\265\213\350\257\225.md"
@@ -30,5 +30,237 @@ module.exports = {
 }
 
 // main.test.js
+const { add, sub } = require('./main')
 
+test('5+5=10', () => {
+  expect(add(5, 5)).toBe(10)
+})
+
+test('5-5=0', () => {
+  expect(sub(5, 5)).toBe(0)
+})
+```
+
+配置测试命令
+
+```json
+// package.json
+"scripts": {
+  "test": "jest"
+}
+```
+
+初始化`Jest`配置
+
+```shell
+pnpm jest init
+```
+
+默认配置会生成终端测试覆盖率报告，和`covrage`文件夹里面的前端网页报告
+
+`Jest` 的匹配器
+
+- `toBe()`匹配器，是在工作中最常用的一种匹配器，简单的理解它就是相等。这个相当是等同于===的，也就是我们常说的严格相等
+
+```js
+// pass
+test('toBe匹配器', () => {
+  expect('这是一个toBe').toBe('这是一个toBe')
+})
+
+// FAIL
+test('toBe匹配器完全相等', () => {
+  const obj = { number: 999 }
+  expect(obj).toBe({ number: 999 })
+})
+```
+
+- `toEqual()`匹配器，内容相等，就可以通过测试
+
+```js
+// pass
+test('toBe匹配器完全相等', () => {
+  const obj = { number: 999 }
+  expect(obj).toEqual({ number: 999 })
+})
+```
+
+当你不严格匹配但要求值相等时时就可以使用`toEqual()`匹配器
+
+- `toBeNul()` 匹配器只匹配`null`值，需要注意的是不匹配`undefined`的值
+
+```js
+test('toBeNul 只匹配null', () => {
+  const a = null
+  expect(a).toBeNull()
+})
+
+// 等价于
+test('toBeNul 只匹配null', () => {
+  const a = null
+  expect(a).toBe(null)
+})
+```
+
+- `toBeUndifined()`匹配
+
+```js
+test('toBeUndifined', () => {
+  const a = undefined
+  expect(a).toBeUndefined()
+})
+```
+
+- `toBeDefined()` 只要定义过就可以通过
+
+```js
+test('toBeDefine', () => {
+  const a = 1
+  expect(a).toBeDefined()
+})
+```
+
+- `toBeTruthy()` 只要不是`false`，`0`，`""`，`null`，`undefined`，`NaN`，就可以通过
+
+```js
+// pass
+test('toBeTruthy', () => {
+  const a = 1
+  expect(a).toBeTruthy()
+})
+
+// fail
+test('toBeTruthy', () => {
+  const a = 0
+  expect(a).toBeTruthy()
+})
+```
+
+- `toBeFalsy()` 与`toBeTruthy()`相对
+
+```js
+test('toBeFalsy', () => {
+  const a = 0
+  expect(a).toBeFalsy()
+})
+```
+
+- `toBeGreaterThan(number | bigint)`大于什么数值，只要大于传入的数值，就可以通过测试
+
+```js
+test('toBeGreaterThan匹配器', () => {
+  const a = 10
+  expect(a).toBeGreaterThan(9.9);
+});
+
+test('toBeGreaterThan匹配器', () => {
+  const a = 10n
+  expect(a).toBeGreaterThan(9n);
+});
+```
+
+- `toBeGreaterThanOrEqual(number | bigint)`大于等于什么数值，只要大于等于传入的数值，就可以通过测试
+
+```js
+test(`toBeGreaterThanOrEqual()`, () => {
+  const a = 10
+  expect(a).toBeGreaterThanOrEqual(10);
+})
+```
+
+- `toBeLessThan(number | bigint)` 小于什么数值，只要小于传入的数值，就可以通过测试
+
+```js
+test(`toBeLessThan()`, () => {
+  const a = 10
+  expect(a).toBeLessThan(100);
+})
+```
+
+- `toBeLessThanOrEqual(number | bigint)` 小于等于什么数值，只要小于等于传入的数值，就可以通过测试
+
+```js
+test(`toBeLessThanOrEqual()`, () => {
+  const a = 10
+  expect(a).toBeLessThanOrEqual(10);
+})
+```
+
+- `toBeCloseTo(number, numDigits?)` 这个是可以自动消除JavaScript浮点精度错误的匹配器
+
+```js
+// fails
+test('toEqual匹配器', () => {
+  const one = 0.1
+  const two = 0.2
+  // expect(one + two).toEqual(0.3)
+})
+
+// pass
+test('toBeCloseTo', () => {
+  const one = 0.1
+  const two = 0.2
+  expect(one + two).toBeCloseTo(0.3, 5);
+})
+```
+
+- `toMatch(regexp | string)` 字符串包含匹配器
+
+```js
+test('toMatch()', () => {
+  const a = 'qwertyuiop'
+  expect(a).toMatch('iop');
+})
+```
+
+- `toContain(item)` 字符串数组包含匹配器
+
+```js
+test('toContain()', () => {
+  const a = ['a', 'b', 'c', 'd']
+  expect(a).toContain('c');
+})
+
+test('toContain()', () => {
+  const a = ['a', 'b', 'c', 'd', 'a']
+  const mySet = new Set(a)
+  expect(mySet).toContain('c');
+})
+```
+
+- `toThrow(error?)` 专门对异常进行处理的匹配器，可以检测一个方法会不会抛出异常,可以对这个匹配器中加一些字符串，意思就是抛出的异常必须和字符串相对应,如果字符串不匹配，也没办法通过异常测试
+
+```js
+test('toThrow', () => {
+  const a = () => {
+    throw new Error('error')
+  }
+  expect(() => {
+    a()
+  }).toThrow('error');
+})
+```
+
+- `.not` 取反
+
+```js
+test('not', () => {
+  expect(1).not.toBe(2)
+})
+```
+
+### 引入`ES6`支持和`import`
+
+`Jest` 默认支持的是 `CommonJS` 规范,使用`babel` 转换成 `CommonJS` 规范
+
+```shell
+pnpm add --save-dev babel-jest @babel/core @babel/preset-env
+```
+
+可以在工程的根目录下创建一个`babel.config.js`文件用于配置与你当前Node版本兼容的`Babel`
+
+```js
+module.exports = {
+  presets: [['@babel/preset-env', {targets: {node: 'current'}}]],
+};
 ```