test: add more unit test

[Wxh16144]

I'd like to report an issue (though I'm not entirely sure whether it's a bug or just user error).

I found an issue report on ant-design/ant-design#51867.

After investigating, I traced it down to stylis having problems with parsing the @layer query.

Here's a minimal example:

import { compile, serialize, stringify } from "stylis"

serialize(compile(`@layer base{}`), stringify) // should return `@layer base{}`

The expected output is @layer base{}, but it actually returns @layer base, missing the {} part.

I also tested @emotion/styled, and it works as expected.

It seems like an edge case, and I believe it's a bug.

Thanks for your time. I hope this gets resolved soon.

[Wxh16144]

Are there any updates? If this is as expected, please close it in a timely manner.