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/low-level/remove.mjs

@@ -0,0 +1,25 @@
+// Unless explicitly stated otherwise all files in this repository are licensed under the Apache 2.0 License.
+//
+// This product includes software developed at Datadog (https://www.datadoghq.com/). Copyright 2021 Datadog, Inc.
+
+import { addHook, removeHook } from '../../index.js'
+import { strictEqual } from 'assert'
+
+const hook = (name, exports) => {
+  if (name.match(/something\.m?js/)) {
+    exports.foo += 15
+  }
+}
+
+addHook(hook)
+
+;(async () => {
+  const { foo: fooMjs } = await import('../fixtures/something.mjs')
+
+  removeHook(hook)
+
+  const { foo: fooJs } = await import('../fixtures/something.js')
+
+  strictEqual(fooMjs, 57)
+  strictEqual(fooJs, 42)
+})()