Version test schema

Author: mradbourne

test/.vscode/settings.json

@@ -4,7 +4,7 @@
             "fileMatch": [
                 "tests/**/*.json"
             ],
-            "url": "./schema.json"
+            "url": "./schemas/tests-schema-0.0.1.json"
         }
     ]
 }

test/README.md

@@ -7,6 +7,6 @@ Some examples of test harnesses using these tests, from the source repository:
 - [Data model stringify tests](https://github.com/messageformat/messageformat/blob/11c95dab2b25db8454e49ff4daadb817e1d5b770/packages/mf2-messageformat/src/data-model/stringify.test.ts)
 - [Formatting tests](https://github.com/messageformat/messageformat/blob/11c95dab2b25db8454e49ff4daadb817e1d5b770/packages/mf2-messageformat/src/messageformat.test.ts)
 
-A [JSON schema](./schema.json) is included for the test files in this repository.
+A JSON schema is included for the test files in this repository. [Semantic-versioned](https://semver.org/) schema files can be found in the [schemas folder](./schemas/).
 
 For users of Visual Studio Code, a [settings file](./.vscode/settings.json) is included that enables schema validation while editing the test files.

test/schema.json renamed to test/schemas/tests-schema-0.0.1.json

@@ -1,5 +1,6 @@
 {
   "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://raw.githubusercontent.com/unicode-org/message-format-wg/main/test/schemas/tests-schema-0.0.1.json",
   "title": "MessageFormat 2 data-driven tests source",
   "description": "This documents the format of MessageFormat 2 source test data.",
   "type": "object",