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/static-import.mjs

@@ -0,0 +1,24 @@
+// 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 Hook from '../../index.js'
+import { foo as fooMjs } from '../fixtures/something.mjs'
+import { foo as fooJs } from '../fixtures/something.js'
+import { freemem } from 'os'
+import { strictEqual } from 'assert'
+
+Hook((exports, name) => {
+  if (name.match(/something\.m?js/)) {
+    exports.foo += 15
+  }
+  if (name === 'os') {
+    Object.defineProperty(exports, 'freemem', {
+      value: () => 47
+    })
+  }
+})
+
+strictEqual(fooMjs, 57)
+strictEqual(fooJs, 57)
+strictEqual(freemem(), 47)