encoding/jsonschema: add tests for empty fragments in metaschema URIs

This adds some tests which currently result in errors, but will
be fixed in a subsequent CL.

Signed-off-by: Roger Peppe <[email protected]>
Change-Id: I57092165d364c980c8b45f9749aa83041aca02c9
Reviewed-on: https://review.gerrithub.io/c/cue-lang/cue/+/1201676
Reviewed-by: Daniel Martí <[email protected]>
TryBot-Result: CUEcueckoo <[email protected]>
Unity-Result: CUE porcuepine <[email protected]>

Author: rogpeppe

encoding/jsonschema/testdata/txtar/extrafragment_version.txtar

@@ -0,0 +1,12 @@
+// This tests that we can use an ID with an empty fragment that's
+// not present in the canonical URI.
+-- schema.json --
+{
+  "$schema": "https://json-schema.org/draft/2019-09/schema#",
+  "$id": "http://example.test",
+  "type": "string"
+}
+-- out/decode/extract --
+ERROR:
+invalid $schema URL "https://json-schema.org/draft/2019-09/schema#": $schema URI not recognized:
+    schema.json:2:3

encoding/jsonschema/testdata/txtar/missingfragment_version.txtar

@@ -0,0 +1,12 @@
+// This tests that we can use an ID without the conventional empty fragment that's
+// present in the canonical URI.
+-- schema.json --
+{
+  "$schema": "http://json-schema.org/draft-04/schema",
+  "id": "http://example.test",
+  "type": "string"
+}
+-- out/decode/extract --
+ERROR:
+invalid $schema URL "http://json-schema.org/draft-04/schema": $schema URI not recognized:
+    schema.json:2:3