Snažím se otestovat, zda moje cesty jsou pracovní, první test projde, když jsem test výchozí "/" cesta, nicméně druhý test neprojde. jediný rozdíl je, že v druhém testu initialEntries={['/register']}
je zaveden, a jako výsledek druhého testu selže z tohoto důvodu:
"Přihlásit se(...): Nic se vrátil z render. To obvykle znamená návrat prohlášení chybí. Nebo, k tomu, aby nic není, vrátí null."
Zkontrolovala jsem ostatní dotazy týkající se tohoto, ale nezdá se, že zápas můj konkrétní problém
to je moje app.js to obsahuje všechny trasy
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;
To je moje 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();
});
});
To je Register.js součástí
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;
a to je test nezdaří popis jsem dostat žádnou pomoc by bylo úžasné, byl jsem zíral na hodiny a cant zdá se najít řešení.
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)