Add minimal tests to vx-gradient components

[Ffloriel]

No description provided.

[hshoff]

Hi @Ffloriel thanks for checking out vx and adding more coverage!

A couple things for this to land:

• Let's hold off on the package-lock.json files until [npm] What should we do about lockfiles? #93 is resolved
• I see you renamed test() => it() let's keep test() for now to stay consistent with the other packages

Once those are done, I'd be happy to merge.

[Ffloriel]

Hi @hshoff
I was actually trying to be consistent when I changed to it (2 files were using it) but I didn't look at the other packages. It makes more sense to use test in that situation. I will make the requested changes

[hshoff]

@Ffloriel ah that was my fault. thanks for the updates! looks good to me.