"ReferenceError: document is not defined" in Jest

When you setup Jest, and write down some tests. Sometimes it throws a document is not defined. This means Jest can't get the right environment.

So on your package.json, replace:

{
  ...
  "scripts": {
    ...
    "test": "jest"
    ...
  },
}

With:

{
  ...
  "scripts": {
    ...
    "test": "jest --env=jsdom"
    ...
  },
}

We just solved the ReferenceError: document is not defined throwed by Jest.