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/static-import-default.mjs

@@ -0,0 +1,20 @@
+// 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 } from '../../index.js'
+import barMjs from '../fixtures/something.mjs'
+import barJs from '../fixtures/something.js'
+import { strictEqual } from 'assert'
+
+addHook((name, exports) => {
+  if (name.match(/something\.m?js/)) {
+    const orig = exports.default
+    exports.default = function bar () {
+      return orig() + 15
+    }
+  }
+})
+
+strictEqual(barMjs(), 57)
+strictEqual(barJs(), 57)