开玩笑--coverage测试错误：“渲染未返回任何内容”

问题描述

当我运行纱线测试或纱线测试[filename]时，我所有的组件都通过了测试。但是，当我使用--coverage标志运行测试时，出现以下错误，指向我创建的自定义渲染函数的包装器。自定义渲染功能或多或少是从react-testing-library文档中复制/粘贴的：https://testing-library.com/docs/react-testing-library/setup

到目前为止，我尚未尝试使用以下命令：纱线测试-覆盖率，纱线测试-覆盖率--watchAll = false，纱线测试--collectCoverage，npm运行测试--coverage，npm运行测试- coverage --watchAll = false

错误：

Error: Uncaught [Error: Wrapper(...): Nothing was returned from render. This usually means a return statement is missing. Or,to render nothing,return null.]

  82 |              );
  83 |      };
> 84 |      return rtlRender(ui,{ wrapper: Wrapper,...renderOptions });
     |             ^
  85 | };
  86 | 
  87 | const render = (ui: ReactElement,{ store = createStore(appReducer,initialState as AppApiStore),...renderOptions } = {}): RenderResult => {`

自定义渲染功能：

    const Wrapper: React.FC = ({ children }): ReactElement => {
        return (
            <MemoryRouter>
                <Provider store={store}>
                    <IntlProvider messages={messagesEn} locale="en">
                        {children}
                    </IntlProvider>
                </Provider>
            </MemoryRouter>
        );
    };
    return rtlRender(ui,...renderOptions });

测试：

test('App',() => {
    render(<App />);

    fireEvent.click(screen.getByText(/Startpage/));
    expect(screen.getByText('Start page')).toBeInTheDocument();
});

package.json：

{
  "name": "app","version": "0.1.0","private": true,"dependencies": {
    "@formatjs/intl-pluralrules": "^3.2.4","@types/pubsub-js": "^1.8.0","@types/yup": "^0.26.36","axios": "^0.19.2","formik": "^2.1.4","less": "^3.11.3","moment": "^2.24.0","react": "^16.13.1","react-dom": "^16.13.1","react-intl": "^5.4.1","react-media": "^1.10.0","react-redux": "^7.1.3","react-router": "^5.1.2","react-router-dom": "^5.1.2","redux": "^4.0.5","redux-devtools-extension": "^2.13.8","redux-saga": "^1.1.3","yup": "^0.27.0"
  },"devDependencies": {
    "@testing-library/jest-dom": "^4.2.4","@testing-library/react": "^11.0.2","@testing-library/user-event": "^7.1.2","@types/jest": "^24.0.0","@types/node": "^12.0.0","@types/react": "^16.9.0","@types/react-dom": "^16.9.0","@types/react-redux": "^7.1.4","@types/react-router-dom": "^5.1.3","@typescript-eslint/eslint-plugin": "^2.18.0","@typescript-eslint/parser": "^2.18.0","enzyme": "^3.10.0","enzyme-adapter-react-16": "^1.15.1","eslint-config-prettier": "^6.10.0","eslint-plugin-prettier": "^3.1.2","husky": "^1.3.1","jest-environment-jsdom-sixteen": "^1.0.3","lint-staged": "^8.2.1","prettier": "^1.19.1","pretty-quick": "^1.11.1","redux-logger": "^3.0.6","typescript": "~3.8.3"
  },"scripts": {
    "start": "react-scripts start","build": "react-scripts build","test": "react-scripts test --env=jest-environment-jsdom-sixteen","eject": "react-scripts eject","lint:ts": "eslint --ext=jsx,ts,tsx src","eslint-check": ".eslintrc","lint-staged": "lint-staged","pretty-quick": "pretty-quick","build:check": "tsc --noEmit"
  },"browserslist": {
    "production": [
      ">0.2%","not dead","not op_mini all"
    ],"development": [
      "last 1 chrome version","last 1 firefox version","last 1 safari version"
    ]
  },"husky": {
    "hooks": {
      "pre-commit": "lint-staged"
    }
  },"lint-staged": {
    "*.{ts,tsx}": [
      "pretty-quick --staged","eslint --fix --config .eslintrc --fix","git add --patch"
    ]
  }
}

解决方法

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