Allow testing non-catalog fonts about gfregression HOT 6 OPEN

Thanks for filing this.

I'm curious if fonts.googleapis.com/css?family=FAMILY and https://fonts.google.com/download?family=FAMILY are in sync?

We had this issue filed to google/fonts recently, google/fonts#1679

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I just realised we may not be use the api endpoint. This endpoint is for web fonts. I think they've all had some form of post processing (removed OT features etc). I'll need to test this first.

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Yeah I'll download a font with curl/wget so I get the unsubsetted fonts. I'll then diff it against the downloadable versions from the gf site.

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I just downloaded a font using wget from the css endpoint and diffed it against the downloadable family on fonts.google.com. Unfortunately, they're very different. Api fonts lack most of the OT features. I think they're still being run through pyftsubset which is then stripping out these features.

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