Am încercat să testeze dacă traseele sunt de lucru, primul test trece atunci când am testat default "/" traseu, cu toate acestea cel de-al doilea test nu trece. singura diferență este că, în cea de a doua încercare initialEntries={['/register']}
este introdus, și, ca rezultat a doua încercare eșuează, pentru acest motiv:
"Login(...): Nimic nu a fost întors de la render. Acest lucru înseamnă, de obicei, o return lipsește. Sau, pentru a face nimic, întoarce null."
Am verificat la alte întrebări cu privire la acest lucru, dar ei nu par să se potrivească special problema
acest lucru este meu app.js care conține toate rutele
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;
Acest lucru este meu App.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();
});
});
Aceasta este Register.js componenta
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?
<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;
și acest lucru este testul eșuează descriere primesc orice ajutor ar fi minunat am holbat la acest lucru pentru ore si cant par să găsească o soluție.
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)