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

node_modules/ajv/lib/vocabularies/jtd/union.ts

@@ -0,0 +1,12 @@
+import type {CodeKeywordDefinition} from "../../types"
+import {validateUnion} from "../code"
+
+const def: CodeKeywordDefinition = {
+  keyword: "union",
+  schemaType: "array",
+  trackErrors: true,
+  code: validateUnion,
+  error: {message: "must match a schema in union"},
+}
+
+export default def