const fastify = fastify()
  const payload = { hello: 'world' }

  fastify.register((instance, opts) => {
    return promise.reject(new error('kaboom'))
  }).after(function () {
    t.pass('after is called')
  })

  fastify.inject({
    method: 'get',
    url: '/'
  }).then(() => {
    t.fail('this should not be called')
  }).catch(err => {
    t.ok(err)
    t.strictequal(err.message, 'kaboom')
  })