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

node_modules/ajv/dist/runtime/validation_error.d.ts

@@ -0,0 +1,7 @@
+import type { ErrorObject } from "../types";
+export default class ValidationError extends Error {
+    readonly errors: Partial<ErrorObject>[];
+    readonly ajv: true;
+    readonly validation: true;
+    constructor(errors: Partial<ErrorObject>[]);
+}