Başarısız Test: Render'dan hiçbir şey döndürülmedi. aynı test geçer, başarısız test ile tek fark başlangıç girişlerinin kullanılmasıdır

Question 1

Rotalarımın çalışıp çalışmadığını test etmeye çalışıyorum, varsayılan " / " rotasını test ettiğimde ilk test geçiyor, ancak ikinci test geçmiyor. tek fark, ikinci testte initialEntries={['/register']} tanıtıldı ve sonuç olarak ikinci test bu nedenle başarısız oldu:

"Oturum(...): Render'dan hiçbir şey iade edilmedi. Bu genellikle bir return deyimi eksik. Veya hiçbir şey işlemek için null döndürün."

Bununla ilgili diğer soruları kontrol ettim ama benim özel problemimle uyuşmuyor gibi görünüyorlar

bu benim uygulamam.tüm rotaları içeren js

import React from 'react';
import {BrowserRouter as Router, Route, Switch} from 'react-router-dom'
import PrivateRoute from './components/PrivateRoute';
import Login from './components/LoginRegister/Login';
import Dashboard from './components/Dashboard/Dashboard';
import Register from './components/LoginRegister/Register';
import PageNotFound from './components/Pages/PageNotFound';
import Header from './components/LoginRegister/Header';
function App() {

  return (
    <Router>
      <div className="main-container">
          <div className="Route-container">
          <Header/>
              <Switch>
                <PrivateRoute exact path = '/dashboard' component = {Dashboard}></PrivateRoute> 
                <Route exact path = '/' component = {Login} />
                <Route exact path = '/test' component = {Dashboard} />
                <Route exact path = '/register' component = {Register} /> 
                <Route component = {PageNotFound} /> 
              </Switch>
          </div>
        </div>
    </Router>
  );
}

export default App;

Bu benim uygulamam.test.js

import React from 'react'
import { render, screen } from '@testing-library/react';
import { MemoryRouter } from 'react-router';
import App from "./App";
import Dashboard from './components/Dashboard/Dashboard'; 
import Header from './components/LoginRegister/Header';
import Login from './components/LoginRegister/Login';
import Register from './components/LoginRegister/Register';
import PageNotFound from './components/Pages/PageNotFound';
import '@testing-library/jest-dom/extend-expect';

jest.mock('./components/Dashboard/Dashboard');
jest.mock('./components/LoginRegister/Login');
jest.mock('./components/LoginRegister/Register');
jest.mock('./components/Pages/PageNotFound');
jest.mock('./components/LoginRegister/Header');

describe("App component", () =>{
    it("renders page header and login component on default route", ()=>{
        Header.mockImplementation(()=> <div>HeaderMock</div>);
        Login.mockImplementation(()=> <div>LoginMock</div>);

        render(
          <MemoryRouter>
            <App />
          </MemoryRouter>
        );
        
        expect(screen.getByText("HeaderMock")).toBeInTheDocument();
        expect(screen.getByText("LoginMock")).toBeInTheDocument();
    });

    it("Renders page header and Register component on Register route", ()=>{
      Header.mockImplementation(()=> <div>HeaderMock</div>);
      Register.mockImplementation(()=> <div>RegisterMock</div>);

      render(
        <MemoryRouter initialEntries={['/register']}>
            <App />
        </MemoryRouter>
      );
      
      expect(screen.getByText("HeaderMock")).toBeInTheDocument();
      expect(screen.getByText("RegisterMock")).toBeInTheDocument();
  });
});

Bu Kayıt Defteri.js bileşeni

import React from 'react'
import { useState } from 'react';
import { Link, useHistory } from 'react-router-dom';

const initialState = {
    credentials: {
    name: '',
    username: '',
    password: ''
  }
}

function Register() {
    const [state, setState] = useState(initialState)
    const history = useHistory()

    function goToLogin () {
        history.push('/')
    }

function handleChange(e) {
    setState({
        credentials: {
            ...state.credentials,
            [e.target.name]: e.target.value
        }
    })
   }
    return (
        <div className = "main-container">
            
            <div className = "middle-section">
                
                <div className= "login-section">
                
                    <div className = "selection login-flex-item">
                        Already a member? &nbsp;
                        <Link to ='/' className = 'select-logreg'>Login</Link>
                    </div>

                    <form className = 'login-flex-item' onSubmit = {goToLogin}>
                
                        <input className = 'form-item'
                            type = 'text'
                            name = 'name'
                            placeholder = "Enter Name"
                            value = {state.credentials.name}
                            onChange ={handleChange}
                        />
                        <input className = 'form-item'
                            type = 'text'
                            name = 'username'
                            placeholder = "Username"
                            value = {state.credentials.username}
                            onChange ={handleChange}
                        />
                        <input className = 'form-item'
                            type="password"
                            name="password"
                            placeholder = "Password"
                            value={state.credentials.password}
                            onChange={handleChange}
                        />
                        <button className = 'form-item btn'>Sign Up</button>
                    </form>
                </div>
            </div>
        </div>
    );
};

export default Register;

ve bu, herhangi bir yardım aldığım test başarısızlığı açıklamasıdır, saatlerce buna bakıyorum ve bir çözüm bulamıyor gibi görünüyor.

 FAIL  src/App.test.js
  App component
    √ renders page header and login component on default route (33 ms)
    × Renders page header and Register component on Register route (198 ms)

  ● App component › Renders page header and Register component on Register route

    Login(...): Nothing was returned from render. This usually means a return statement is missing. Or, to render nothing, return null.

      35 |       Register.mockImplementation(()=> <div>RegisterMock</div>);
      36 |
    > 37 |       render(
         |       ^
      38 |         <MemoryRouter initialEntries={['/register']}>
      39 |             <App />
      40 |         </MemoryRouter>

      at reconcileChildFibers (node_modules/react-dom/cjs/react-dom.development.js:14169:23)
      at reconcileChildren (node_modules/react-dom/cjs/react-dom.development.js:16990:28)
      at mountIndeterminateComponent (node_modules/react-dom/cjs/react-dom.development.js:17890:5)
      at beginWork (node_modules/react-dom/cjs/react-dom.development.js:19049:16)
      at HTMLUnknownElement.callCallback (node_modules/react-dom/cjs/react-dom.development.js:3945:14)
      at HTMLUnknownElement.callTheUserObjectsOperation (node_modules/jsdom/lib/jsdom/living/generated/EventListener.js:26:30)
      at innerInvokeEventListeners (node_modules/jsdom/lib/jsdom/living/events/EventTarget-impl.js:338:25)
      at invokeEventListeners (node_modules/jsdom/lib/jsdom/living/events/EventTarget-impl.js:274:3)
      at HTMLUnknownElementImpl._dispatch (node_modules/jsdom/lib/jsdom/living/events/EventTarget-impl.js:221:9)
      at HTMLUnknownElementImpl.dispatchEvent (node_modules/jsdom/lib/jsdom/living/events/EventTarget-impl.js:94:17)
      at HTMLUnknownElement.dispatchEvent (node_modules/jsdom/lib/jsdom/living/generated/EventTarget.js:231:34)
      at Object.invokeGuardedCallbackDev (node_modules/react-dom/cjs/react-dom.development.js:3994:16)
      at invokeGuardedCallback (node_modules/react-dom/cjs/react-dom.development.js:4056:31)
      at beginWork$1 (node_modules/react-dom/cjs/react-dom.development.js:23964:7)
      at performUnitOfWork (node_modules/react-dom/cjs/react-dom.development.js:22779:12)
      at workLoopSync (node_modules/react-dom/cjs/react-dom.development.js:22707:5)
      at renderRootSync (node_modules/react-dom/cjs/react-dom.development.js:22670:7)
      at performSyncWorkOnRoot (node_modules/react-dom/cjs/react-dom.development.js:22293:18)
      at scheduleUpdateOnFiber (node_modules/react-dom/cjs/react-dom.development.js:21881:7)
      at updateContainer (node_modules/react-dom/cjs/react-dom.development.js:25482:3)
      at node_modules/react-dom/cjs/react-dom.development.js:26021:7
      at unbatchedUpdates (node_modules/react-dom/cjs/react-dom.development.js:22431:12)
      at legacyRenderSubtreeIntoContainer (node_modules/react-dom/cjs/react-dom.development.js:26020:5)
      at Object.render (node_modules/react-dom/cjs/react-dom.development.js:26103:10)
      at node_modules/@testing-library/react/dist/pure.js:101:25
      at batchedUpdates$1 (node_modules/react-dom/cjs/react-dom.development.js:22380:12)
      at act (node_modules/react-dom/cjs/react-dom-test-utils.development.js:1042:14)
      at render (node_modules/@testing-library/react/dist/pure.js:97:26)
      at Object.<anonymous> (src/App.test.js:37:7)

Question 2

Doktordan<Router>:

Tüm yönlendirici bileşenleri için ortak alt düzey arabirim. Genellikle uygulamalar bunun yerine üst düzey yönlendiricilerden birini kullanır:

<BrowserRouter>

<HashRouter>

<MemoryRouter>

<NativeRouter>

<StaticRouter>

Konu <BrowserRouter> bileşen sarılır <MemoryRouter> bunun gibi:

<MemoryRouter>
  <BrowserRouter>
    <Switch>
     ....
    </Switch>
  </BrowserRouter>
</MemoryRouter>

Bu size verecek location -den <BrowserRouter> olacak :

location:  { pathname: '/', search: '', hash: '', state: undefined }

Paylaşmalısın <Switch> ve çocukları gibi bağımsız bir bileşen olarak Routes:

import React from 'react';
import { BrowserRouter as Router, Route, Switch, useLocation } from 'react-router-dom';

const Login = () => <div>login</div>;
const Register = () => <div>Register</div>;

export const Routes = () => {
  const location = useLocation();
  console.log('location: ', location);
  return (
    <Switch>
      <Route exact path="/" component={Login} />
      <Route exact path="/register" component={Register} />
    </Switch>
  );
};

function App() {
  return (
    <Router>
      <Routes />
    </Router>
  );
}

export default App;

Böylece kullanabilirsiniz Routes ile <MemoryRouter> test için:

import React from 'react';
import { MemoryRouter } from 'react-router-dom';
import { render, screen } from '@testing-library/react';
import '@testing-library/jest-dom/extend-expect';
import { Routes } from './app';

describe('App component', () => {
  it('renders page header and login component on default route', () => {
    render(
      <MemoryRouter>
        <Routes />
      </MemoryRouter>
    );
    expect(screen.getByText('login')).toBeInTheDocument();
  });

  it('Renders page header and Register component on Register route', () => {
    render(
      <MemoryRouter initialEntries={['/register']}>
        <Routes />
      </MemoryRouter>
    );
    expect(screen.getByText('Register')).toBeInTheDocument();
  });
});

test sonucu:

 PASS  examples/70090905/app.test.tsx (8.087 s)
  App component
    ✓ renders page header and login component on default route (45 ms)
    ✓ Renders page header and Register component on Register route (3 ms)

  console.log
    location:  {
      pathname: '/',
      search: '',
      hash: '',
      state: undefined,
      key: 'zlnxcn'
    }

      at Routes (examples/70090905/app.tsx:9:11)

  console.log
    location:  {
      pathname: '/register',
      search: '',
      hash: '',
      state: undefined,
      key: '8z804n'
    }

      at Routes (examples/70090905/app.tsx:9:11)

Test Suites: 1 passed, 1 total
Tests:       2 passed, 2 total
Snapshots:   0 total
Time:        8.625 s, estimated 11 s

Açıklayıcı ve gösteri amaçlı olarak gereksiz kodu kaldırdım.

Paket sürümleri:

"react-router-dom": "^5.2.0"

slideshowp2 · Answer 1 · 2021-11-24T07:54:05

Doktordan<Router>:

Tüm yönlendirici bileşenleri için ortak alt düzey arabirim. Genellikle uygulamalar bunun yerine üst düzey yönlendiricilerden birini kullanır:

<BrowserRouter>

<HashRouter>

<MemoryRouter>

<NativeRouter>

<StaticRouter>

Konu <BrowserRouter> bileşen sarılır <MemoryRouter> bunun gibi:

<MemoryRouter>
  <BrowserRouter>
    <Switch>
     ....
    </Switch>
  </BrowserRouter>
</MemoryRouter>

Bu size verecek location -den <BrowserRouter> olacak :

location:  { pathname: '/', search: '', hash: '', state: undefined }

Paylaşmalısın <Switch> ve çocukları gibi bağımsız bir bileşen olarak Routes:

import React from 'react';
import { BrowserRouter as Router, Route, Switch, useLocation } from 'react-router-dom';

const Login = () => <div>login</div>;
const Register = () => <div>Register</div>;

export const Routes = () => {
  const location = useLocation();
  console.log('location: ', location);
  return (
    <Switch>
      <Route exact path="/" component={Login} />
      <Route exact path="/register" component={Register} />
    </Switch>
  );
};

function App() {
  return (
    <Router>
      <Routes />
    </Router>
  );
}

export default App;

Böylece kullanabilirsiniz Routes ile <MemoryRouter> test için:

import React from 'react';
import { MemoryRouter } from 'react-router-dom';
import { render, screen } from '@testing-library/react';
import '@testing-library/jest-dom/extend-expect';
import { Routes } from './app';

describe('App component', () => {
  it('renders page header and login component on default route', () => {
    render(
      <MemoryRouter>
        <Routes />
      </MemoryRouter>
    );
    expect(screen.getByText('login')).toBeInTheDocument();
  });

  it('Renders page header and Register component on Register route', () => {
    render(
      <MemoryRouter initialEntries={['/register']}>
        <Routes />
      </MemoryRouter>
    );
    expect(screen.getByText('Register')).toBeInTheDocument();
  });
});

test sonucu:

 PASS  examples/70090905/app.test.tsx (8.087 s)
  App component
    ✓ renders page header and login component on default route (45 ms)
    ✓ Renders page header and Register component on Register route (3 ms)

  console.log
    location:  {
      pathname: '/',
      search: '',
      hash: '',
      state: undefined,
      key: 'zlnxcn'
    }

      at Routes (examples/70090905/app.tsx:9:11)

  console.log
    location:  {
      pathname: '/register',
      search: '',
      hash: '',
      state: undefined,
      key: '8z804n'
    }

      at Routes (examples/70090905/app.tsx:9:11)

Test Suites: 1 passed, 1 total
Tests:       2 passed, 2 total
Snapshots:   0 total
Time:        8.625 s, estimated 11 s

Açıklayıcı ve gösteri amaçlı olarak gereksiz kodu kaldırdım.

Paket sürümleri:

"react-router-dom": "^5.2.0"

Başarısız Test: Render'dan hiçbir şey döndürülmedi. aynı test geçer, başarısız test ile tek fark başlangıç girişlerinin kullanılmasıdır

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