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/v14-double-hook.mjs

@@ -0,0 +1,33 @@
+import { fileURLToPath } from 'url'
+import { join } from 'path'
+import { strictEqual } from 'assert'
+import Hook from '../../index.js'
+
+const toWrap = join(fileURLToPath(import.meta.url), '..', '..', 'fixtures', 'foo.mjs')
+
+Hook([toWrap], (exports) => {
+  const original = exports.foo
+  exports.foo = function foo () {
+    return original() + '-first'
+  }
+})
+
+Hook([toWrap], (exports) => {
+  const original = exports.foo
+  exports.foo = function foo () {
+    return original() + '-second'
+  }
+})
+
+Hook([toWrap], (exports) => {
+  const shouldNotExist = exports.default
+  exports = function () {
+    return shouldNotExist()
+  }
+})
+
+const imp = await import('../fixtures/foo.mjs')
+
+strictEqual(imp.foo(), 'foo-first-second')
+// This should not throw!
+strictEqual(imp.default, undefined)