Add a test for #1438

[szmarczak]

szm@solus ~/Desktop/got $ npm run build && ava test/promise.ts -v

> got@11.6.2 build /home/szm/Desktop/got
> del-cli dist && tsc


  ✔ promise.json() can be called before a file stream body is open
false PCancelable [Promise] {
  _cancelHandlers: [ [Function (anonymous)], [Function (anonymous)] ],
  _isPending: false,
  _isCanceled: true,
  _rejectOnCancel: false,
  _reject: [Function (anonymous)],
  _promise: Promise {
    <rejected> CancelError: Promise was canceled
        at /home/szm/Desktop/got/dist/source/as-promise/index.js:40:35
        at PCancelable.cancel (/home/szm/Desktop/got/node_modules/p-cancelable/index.js:86:6)
        at /home/szm/Desktop/got/dist/test/promise.js:71:13
        at /home/szm/Desktop/got/dist/test/helpers/with-server.js:37:15
        at processTicksAndRejections (internal/process/task_queues.js:93:5) {
      code: undefined,
      timings: undefined
    }
  },
  on: [Function (anonymous)],
  json: [Function (anonymous)],
  buffer: [Function (anonymous)],
  text: [Function (anonymous)],
  asdf: 123
} Promise {
  <rejected> CancelError: Promise was canceled
      at /home/szm/Desktop/got/dist/source/as-promise/index.js:40:35
      at PCancelable.cancel (/home/szm/Desktop/got/node_modules/p-cancelable/index.js:86:6)
      at /home/szm/Desktop/got/dist/test/promise.js:71:13
      at /home/szm/Desktop/got/dist/test/helpers/with-server.js:37:15
      at processTicksAndRejections (internal/process/task_queues.js:93:5) {
    code: undefined,
    timings: undefined
  },
  _cancelHandlers: [ [Function (anonymous)], [Function (anonymous)] ],
  _isPending: true,
  _isCanceled: false,
  _rejectOnCancel: false,
  _reject: [Function (anonymous)],
  _promise: Promise {
    <rejected> CancelError: Promise was canceled
        at /home/szm/Desktop/got/dist/source/as-promise/index.js:40:35
        at PCancelable.cancel (/home/szm/Desktop/got/node_modules/p-cancelable/index.js:86:6)
        at /home/szm/Desktop/got/dist/test/promise.js:71:13
        at /home/szm/Desktop/got/dist/test/helpers/with-server.js:37:15
        at processTicksAndRejections (internal/process/task_queues.js:93:5) {
      code: undefined,
      timings: undefined
    }
  },
  on: [Function (anonymous)],
  json: [Function (anonymous)],
  buffer: [Function (anonymous)],
  text: [Function (anonymous)],
  asdf: 123
}

  Unhandled rejection in test/promise.ts

  CancelError: Promise was canceled

  › dist/source/as-promise/index.js:40:35
  › PCancelable.cancel (node_modules/p-cancelable/index.js:86:6)
  › dist/test/promise.js:71:13
  › dist/test/helpers/with-server.js:37:15

  ─

  1 test passed
  1 unhandled rejection

[szmarczak]

@sindresorhus Do you know why it says unhandled rejection? I can clearly see that these promises are the same but p === promise gives false 🤯

[Giotino]

The promises are not the same object.

The first is generated by this:
https://github.com/sindresorhus/got/blob/weird-rejection/source/as-promise/index.ts#L31

The second is a "clone" of the first generated by this:
https://github.com/sindresorhus/got/blob/weird-rejection/source/as-promise/index.ts#L175-L188

I pushed a commit that should fix the test (I've not removed your debug stuff).
But there's one more thing: is got supposed to work like that?

I think: yes. Because these are 2 different promises with different outcomes, for example the json one could fail because the response is not a JSON.