nock('https://xxxx.com').get('/').times(1).reply(200, { mock: 1 });

// first times: print { mock: 1 }
// second and third times: throw error `Nock: No match for request`
for (let i = 0; i < 3; i++) {
  const {data} = await axios({
    url: 'https://xxxx.com/',
    method: 'GET',
  });
  console.log(data);
}