redux-saga call() not working?

saga.js

import { put, call, takeEvery } from 'redux-saga/effects'
import * as Actions from '@actions/Artsy'

export function* fetchData(client, artworkId) {
  yield call(Actions.artsyFetchStart)

  try {
    const artwork = yield call(client.getData, { id: artworkId }) // this returns undefined

    yield call(Actions.artsyFetchSuccess)
    yield call(Actions.recieveArtwork, artwork)
    return artwork
  } catch (error) {
    yield call(Actions.artsyFetchFailure)
  }
}

export function* watchFetchArtwork() {
  yield takeEvery(Actions.ARTSY_FETCH_ARTWORK, fetchArtwork)
}

test.js

import { fetchData } from './saga'

describe('Saga', () => {
  const mockClient = {
    getData: ({ id }) =>
      new Promise(res => {
        res({ id })
        return { id }
      }),
  }


  describe('fetchData', () => {
    it('should call getData', () => {
      const gen = fetchData(mockClient, 1)

      expect(gen.next().value).toEqual(call(artsyFetchStart)) // this works
      expect(gen.next().value).toEqual(call(mockClient.getData, { id: 1 })) // this works
      expect(gen.next().value).toEqual(call(artsyFetchSuccess)) // this works
      
      expect(gen.next().value).toEqual(call(recieveArtwork, { id: 1 })) // this fails, says argument is called with `undefined`
    })
  })
})