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                            # React測試
安裝 react-testing-library、react-dom、react-scripts
安裝 jest、jest-dom

測試用例
```
import React from "react";
import { render, cleanup, fireEvent } from "react-testing-library";
import { App } from "./index";

afterEach(cleanup);

describe("基礎React單元測試", function () {
  it("index組件測試", function () {
    const { getByTestId } = render(<App />);
    const [ul, nav] = [getByTestId("js-ul"), getByTestId("js-h2")];
    expect(ul.children.length).toBe(2);
    expect(nav.textContent).toContain("京程一燈");
  })
});
```

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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