[base] Remove @mui/system in tests

[kevinji]

@mui/system is used in a test, so it should be explicitly mentioned.

• I have followed (at least) the PR section of the contributing guide.

[mui-bot]

No bundle size changes

Generated by 🚫 dangerJS against e6ea4ef

[michaldudak]

We could remove this dependency. It shouldn't be necessary to use System in Base components unit tests.

If we defined the components as such, it would be possible to remove the import from @mui/base:

const SelectListbox = React.forwardRef(function SelectListbox(
  props: SelectUnstyledListboxSlotProps<string>,
  ref: React.ForwardedRef<HTMLUListElement>,
) {
  const { ownerState, ...other } = props;
  return <ul {...other} ref={ref} style={{ maxHeight: '100px', overflow: 'auto' }} />;
});

const Option = React.forwardRef(function Option(
  props: { value: string; children?: React.ReactNode },
  ref: React.Ref<HTMLLIElement>,
) {
  return (
    <OptionUnstyled
      {...props}
      ref={ref}
      componentsProps={{ root: { style: { height: '50px' } } }}
    />
  );
});

[kevinji]

Sounds good, I've updated the file as suggested.

[michaldudak]

Thanks a lot!