Ido Rosenthal

complex / inline data url breaks background

1

``` jsx { "background": "url(data:image/svg+xml;utf8,)" } { "background": "url(http://www.somesite.com/assets/pic.jpg)" } ``` should output: ``` jsx { "background-image": "url(data:image/svg+xml;utf8,)" } { "background-image": "url(http://www.somesite.com/assets/pic.jpg)" } ```

This PR add test coverage for the `upgrade` command. This PR doesn't change any of the anything, it just maps the current behavior. The tests are using the programmatic API...

### I'm using React Router as a... framework ### Reproduction **With normal CSS (`.css`):** 1. either open this [stackblitz example](https://stackblitz.com/edit/github-23c2witu?file=app%2Froutes%2Fhome.css,app%2Froutes%2Fhome.tsx) or create a new React Router project from a template...