Error when running with jest

```js
console.error node_modules/jsdom-worker/dist/jsdom-inline-worker.js:1
Error: only absolute urls are supported
at /Users/aaronvasquez/Oyster/webnode/directories/node_modules/node-fetch/index.js:54:10
at new Promise ()
at new Fetch (/Users/aaronvasquez/Oyster/webnode/directories/node_modules/node-fetch/index.js:49:9)
at Fetch (/Users/aaronvasquez/Oyster/webnode/directories/node_modules/node-fetch/index.js:37:10)
at Object..global.fetch (/Users/aaronvasquez/Oyster/webnode/directories/node_modules/jsdom-worker/dist/jsdom-inline-worker.js:1:876)
at new Worker (/Users/aaronvasquez/Oyster/webnode/directories/node_modules/jsdom-worker/dist/jsdom-inline-worker.js:1:1780)
at /Users/aaronvasquez/Oyster/webnode/directories/src/utils/bg-worker/index.js:12:29
at new Promise ()
at performTask (/Users/aaronvasquez/Oyster/webnode/directories/src/utils/bg-worker/index.js:11:5)
at Object. (/Users/aaronvasquez/Oyster/webnode/directories/src/utils/bg-worker/bg-worker.test.js:9:29)
at resolve (/Users/aaronvasquez/Oyster/webnode/directories/node_modules/jest-jasmine2/build/queueRunner.js:38:12)
at new Promise ()
at mapper (/Users/aaronvasquez/Oyster/webnode/directories/node_modules/jest-jasmine2/build/queueRunner.js:31:21)
at Promise.resolve.then.el (/Users/aaronvasquez/Oyster/webnode/directories/node_modules/p-map/index.js:46:16)
at
at process._tickCallback (internal/process/next_tick.js:188:7)
```

This is what I have in my test file:
```js
import "jsdom-worker";
```

Inizia eseguendo src/utils/bg-worker/bg-worker.test.js e leggendo src/utils/bg-worker/index.js, concentrandoti sulla costruzione di Worker mostrata nello stack trace. Traccia come l’importazione di jsdom-worker porta node-fetch a ricevere un URL non assoluto; il lavoro è completato quando il test Jest viene eseguito senza questo errore e mantiene il comportamento previsto.

Scritto dal modello di indicizzazione a partire dal testo della issue.