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                            # 通用測試框架 Jest
[https://jestjs.io/docs/en/getting-started.html](https://jestjs.io/docs/en/getting-started.html)
create-react-app 腳手架已經自帶 Jest 和 react-testing-library

# React Testing Library
目前版本的腳手架已自動安裝。
```
"@testing-library/jest-dom":  "^4.2.4",
"@testing-library/react":  "^9.3.2",
"@testing-library/user-event":  "^7.1.2",
```
jest-dom 是 react testting library 的擴展插件：[https://github.com/testing-library/jest-dom](https://github.com/testing-library/jest-dom)，這個腳手架也也會自動安裝。其作用就是寫測試代碼時多了一些簡便的方法。

# 模擬函數的調用
[https://jestjs.io/docs/en/mock-functions](https://jestjs.io/docs/en/mock-functions)



                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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