Test for invalid use of fragments in "$id"

[handrews]

• fragment-only plain name: "$id": "#foo"
• fragment-only JSON Pointer: "$id": "#/a/b"
• URI with at least one other component plus a non-empty plain name fragment
• URI with at least one other component plus a non-empty JSON Pointer name fragment

[karenetheridge]

Take care -- that first one, "$id": "#foo", is legal in draft7, but not 2019-09 (moved to $anchor). I would just copy some tests out of tests/draft7/refRemote.json and s/valid/invalid/ as appropriate.

[ssilverman]

@karenetheridge did you mean ref.json and not refRemote.json? I see fragments in the first but not the second.

[karenetheridge]

@ssilverman I expect I was looking at an outdated version of the test suite.