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

node_modules/y18n/build/lib/cjs.js

@@ -0,0 +1,6 @@
+import { y18n as _y18n } from './index.js';
+import nodePlatformShim from './platform-shims/node.js';
+const y18n = (opts) => {
+    return _y18n(opts, nodePlatformShim);
+};
+export default y18n;