Clarify the expected public suffix of leading dot domains

[sethmlarson]

The test cases using checkPublicSuffix() take the domain and the expected privately registered domain as input but don't have any checks for what the public suffix of the domain is. In many cases this is just the privately registered domain minus the leading label. (Or all labels in the null case)

For a domain like .example.com which is expected to return null for the private domain, what is the expected "public suffix": null, example.com?

Is there any way that the test cases can be expanded to also include what the public suffix of a given domain should be?

[simon-friedberger]

@sethmlarson Could you clarify what exactly you are trying to accomplish?

Afaiu .example.com is technically not a domain, plus our general stance is that the PSL is only a list and is up for interpretation (mostly because people cannot agree on what it should mean).