So in my program, when a user logs in, if all credentials are correct they will proceed to the next page if any details are missing or incorrect format, and alert is shown on screen. How do I tes...

I have a straight forward react-comp. which I want to test the styling depending on the react state. The comp looks like the following: React-comp. const Backdrop = ({ showBackdrop }) => { cons...

My test passes but has a console refrenceError: You are trying to access a property or method of the Jest environment after it has been torn down. Test: import {render, screen, cleanup, fireEvent, ...

I'm new to testing React/Typescript apps. I want to unit test my React components, because I'm not satisfied to develop apps without tests at all. The app itself works fine, it's just failing to ru...

When trying to write a simple test with jest lib for Modal component like this import { Modal } from '@material-ui/core'; import React from 'react'; import TestRenderer from 'react-test-renderer';...

I have a component that uses useContext and then its output is dependent on the value in the context. A simple example: import React, { useContext } from 'react'; const MyComponent = () => { ...

I am unit testing my react component using renderer of react-test-renderer. it was working fine, but after using ReactCssTransitionGroup I am getting the following error "TypeError: Cannot read pro...

I am using react-test-renderer with Jest to test react components. But if I test a react-mui modal dialog like this: describe('Dashboard', function () { let dashboard; beforeEach(async () => ...

I'm using React-18.0.0 in my project and in the test file I'm getting an error something below createRoot(...): Target container is not a DOM element. My test file is : import ReactDOM from 'reac...

I have to components imported with the new React lazy API (16.6). import React, {PureComponent, lazy} from 'react'; const Component1 = lazy(() => import('./Component1')); const Component2 = l...

Let's say I have the following basic component called Basic.js: import React, { useState, useEffect } from 'react'; export default () => { const [items, setItems] = useState([{ name: 'origina...

I'm new to React and confused about all the testing libraries. I got my test code to work but it seems redundant to have to call create() from react-test-renderer in order to use its toMatchSnapsho...

I am trying to do snapshot testing in my React app. I am already using react-testing-library for unit testing in general. However for snapshot testing I have seen different ways of doing it on the ...

I'm writing tests for my react page but my page uses an isLoading in its state, when loading the page renders 'Loading', when loaded but no data (from the fetch request) is renders 'No data found' ...

I'm new to testing React/Typescript apps. command (alias for react-scripts test): yarn test output: FAIL src/containers/pages/Feature/Feature.test.tsx ● Test suite failed to run Target con...

I'm using React Test Renderer with Jest to test my React Native app. Here is a simple code example of what I'm doing: it('renders one text', () => { const text = 'bar'; const instance = rend...

My React-application has a component that fetches data to display from a remote server. In the pre-hooks era, componentDidMount() was the place to go. But now I wanted to use hooks for this. const...

From this docs: https://reactjs.org/docs/hooks-faq.html#how-to-test-components-that-use-hooks The docs provide a way to setup and teardown the test like this: let container; beforeEach(() => ...

So I have a component that shows some text fields. One input, one select and based on the input the user uses on that select, (The value of the select) the third is shown or not. Im trying to use...

I am using the NumericInput and it works fine when I run the application on my device. However, when I run jest, I get all kind of errors: TypeError: Cannot read property 'default' of undefined ...

For testing I use jest and react-test-renderer. It should be simple to test, however I have a hard time finding the proper example. I have tried to do something like that (in general I keep the fun...

This is my root component: const App = () => ( <Provider store={store}> <PersistGate persistor={persistor} loading={<LoadingView />}> <MainTabNavigator /> </Persi...

I'm starting learning React and while I was doing some tests i noticed two warning messages: Warning: ReactTestUtils has been moved to react-dom/test-utils. Update references to remove this warnin...