[URL] Ensure that path-only URLs do not have their paths erased by th…

[karwa]

…e pathname setter.

See: whatwg/url#582

[karwa]

The first added test (special URLs) is just documenting the status-quo, since there didn't seem to be a test for what happens if you set an empty string.

The second one shows the new behaviour I propose on adding to the standard.

[domenic]

Confirmed that the third test added here fails without the change and passes with it, in jsdom/whatwg-url.

[TimothyGu]

Can we also add a test where the new pathname value is non-empty but rootless, like "test"? A root should be automatically created in that case.

[achristensen07]

Could we also add a test setting a path on a URL without a host? My initial late-night implementation of this change would've failed that test. Like this:

•    {
  

•        "comment": "Non-special URLs can have their paths erased",
  

•        "href": "foo:///some/path",
  

•        "new_value": "",
  

•        "expected": {
  

•            "href": "foo://",
  

•            "pathname": ""
  

•        }
  

•    },
  

[annevk]

Ah, I merged the specification PR but I missed the outstanding comment here. @karwa do you still want to add that additional test?

[annevk]

I added the additional requested tests, once someone reviewed them this should be good to go.

[karwa]

Apologies, I missed this - thanks for adding the tests, @annevk