Update test framework: fix run_tests.py to support all test files, add auto-import-check for test files

node_modules/ajv/dist/refs/data.json

@@ -0,0 +1,13 @@
+{
+  "$id": "https://raw.githubusercontent.com/ajv-validator/ajv/master/lib/refs/data.json#",
+  "description": "Meta-schema for $data reference (JSON AnySchema extension proposal)",
+  "type": "object",
+  "required": ["$data"],
+  "properties": {
+    "$data": {
+      "type": "string",
+      "anyOf": [{"format": "relative-json-pointer"}, {"format": "json-pointer"}]
+    }
+  },
+  "additionalProperties": false
+}