Codesandbox-client: Polyfill `fetch` in tests

[kentcdodds]

I believe that jest does this by default. It'd be great if codesandbox did it too.

Here's an example:

The test that fails:

test('fetch is defined on window', () => {
  expect(window.fetch).toBeDefined()
})

[kentcdodds]

Note, my temporary fix is to add a src/setupTests.js file that does this:

import fetch from 'node-fetch'

if (!window.fetch) {
  window.fetch = fetch
}

[CompuIves]

Good one! This one was an easy fix luckily 😄. I'm expecting to deploy it tomorrow morning if that's okay.

For reference, it now works for me:

[kentcdodds]

That was fast!