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

node_modules/import-in-the-middle/test/hook/v16-got.mjs

@@ -0,0 +1,16 @@
+import got, { Options } from 'got'
+import { strictEqual } from 'assert'
+import Hook from '../../index.js'
+
+Hook((exports, name) => {
+  if (name === 'got' && 'Options' in exports) {
+    exports.Options = 'nothing'
+  }
+})
+
+strictEqual(typeof got, 'function')
+strictEqual(typeof got.post, 'function')
+strictEqual(typeof got.stream, 'function')
+strictEqual(typeof got.extend, 'function')
+
+strictEqual(Options, 'nothing')