TS test notes

Initialize

## Initialize
npx create-react-app . --template typescript
npm install @mui/material @emotion/react @emotion/styled

Mock Fetch.tsx

function mockFetch(url: string) {
    if (url.indexOf('countries/positions') !== -1)
        return {
            ok: true,
            status: 200,
            json: async () => ({ "error": false, "msg": "country and capitals retrieved", "data": { "name": "India", "capital": "New Delhi" } })
        }
}

beforeEach(() => (window.fetch = jest.fn().mockImplementation(mockFetch)))
beforeAll(() => jest.spyOn(window, 'fetch'))

Test

### Links
https://dev.to/mbellagamba/testing-library-recipes-choosing-query-279p
https://github.com/psongpin/react-testing-recipes