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/require-root-cjs.mjs

@@ -0,0 +1,12 @@
+import Hook from '../../index.js'
+import { foo } from '../fixtures/require-root.js'
+import { strictEqual } from 'assert'
+
+Hook((exports, name) => {
+  if (name.endsWith('require-root.js')) {
+    strictEqual(exports.foo, 'something')
+    exports.foo += '-wrap'
+  }
+})
+
+strictEqual(foo, 'something-wrap')