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

node_modules/ajv/lib/runtime/validation_error.ts

@@ -0,0 +1,13 @@
+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>[]) {
+    super("validation failed")
+    this.errors = errors
+    this.ajv = this.validation = true
+  }
+}