Handle invalid responses

[andy-faunadb]

def test_invalid_response
  # Response must be valid JSON
  assert_raises ??? do
    (stub_get 200, 'I like fine wine').get ''
  end
  # Response must have "resource"
  assert_raises ??? do
    (stub_get 200, '{"resoars": 1}').get ''
  end
end