add support/ custom icon for test files (foo.test.js/ foo.test.ts)

[alexn-s]

love your icons. they look really nice modern.

would you consider adding custom icons for js/ ts test files?

[miguelsolorio]

I think that is doable, usually they are just a different color so happy to do that.

[ysjn]

Would be fantastic if you could support these files with same color as *.test.*! :rocket: *.spec.js *.spec.jsx *.spec.ts *.spec.tsx

[miguelsolorio]