fetch().then() is undefined

[SpeCT]

test('GET foo', async () => {
  mock('https://example.com/', { data: { name: 'Foo' } })
  const res = await fetch('https://example.com/).then(r => r.json()) // <<- crash
  expect(res.name).toBe('Foo') // <<- never
})

[DRFR0ST]

Thanks for the contribution @SpeCT 🚀
Your PRs has been merged and are included in the 1.0.9 release.