metamask-extension/test/unit/app/fetch-with-timeout.test.js

import assert from 'assert'
import nock from 'nock'

import fetchWithTimeout from '../../../app/scripts/lib/fetch-with-timeout'

describe('fetchWithTimeout', () => {
  it('fetches a url', async () => {
    nock('https://api.infura.io')
      .get('/money')
      .reply(200, '{"hodl": false}')

    const fetch = fetchWithTimeout()
    const response = await (await fetch('https://api.infura.io/money')).json()
    assert.deepEqual(response, {
      hodl: false,
    })
  })

  it('throws when the request hits a custom timeout', async () => {
    nock('https://api.infura.io')
      .get('/moon')
      .delay(2000)
      .reply(200, '{"moon": "2012-12-21T11:11:11Z"}')

    const fetch = fetchWithTimeout({
      timeout: 123,
    })

    try {
      await fetch('https://api.infura.io/moon').then(r => r.json())
      assert.fail('Request should throw')
    } catch (e) {
      assert.ok(e)
    }
  })

  it('should abort the request when the custom timeout is hit', async () => {
    nock('https://api.infura.io')
      .get('/moon')
      .delay(2000)
      .reply(200, '{"moon": "2012-12-21T11:11:11Z"}')

    const fetch = fetchWithTimeout({
      timeout: 123,
    })

    try {
      await fetch('https://api.infura.io/moon').then(r => r.json())
      assert.fail('Request should be aborted')
    } catch (e) {
      assert.deepEqual(e.message, 'Aborted')
    }
  })
})