useSelector could not find react-redux context value; please ensure the component is wrapped in a <Provider> code example

Example: jest Invariant Violation: could not find react-redux context value; please ensure the component is wrapped in a

import React from 'react'
import { render } from 'react-testing-library'

import App from '../pages/index.js'

import { Provider } from 'react-redux'
import configureStore from 'redux-mock-store'



describe('With React Testing Library', () => {
  const initialState = {output:10}
  const mockStore = configureStore()
  let store,wrapper

  it('Shows "Hello world!"', () => {
    store = mockStore(initialState)
    const { getByText } = render(<Provider store={store}><App /></Provider>)

    expect(getByText('Hello Worldd!')).not.toBeNull()
  })
})