wip: add test based on valentin's test

doesn't currently work with iitm register

experimental/packages/opentelemetry-instrumentation/package.json

@@ -47,7 +47,9 @@
     "tdd": "npm run tdd:node",
     "tdd:node": "npm run test -- --watch-extensions ts --watch",
     "tdd:browser": "karma start",
-    "test": "nyc ts-mocha -p tsconfig.json 'test/**/*.test.ts' --exclude 'test/browser/**/*.ts'",
+    "test:cjs": "nyc ts-mocha -p tsconfig.json 'test/**/*.test.ts' --exclude 'test/browser/**/*.ts'",
+    "test:esm": "nyc node --experimental-loader=import-in-the-middle/hook.mjs ../../../node_modules/mocha/bin/mocha 'test/node/*.test.mjs' test/node/*.test.mjs",
+    "test": "npm run test:cjs && npm run test:esm",
     "test:browser": "nyc karma start --single-run",
     "version": "node ../../../scripts/version-update.js",
     "watch": "tsc --build --watch tsconfig.json tsconfig.esm.json tsconfig.esnext.json",

experimental/packages/opentelemetry-instrumentation/test/node/EsmInstrumentation.test.mjs

@@ -0,0 +1,49 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import * as assert from 'assert';
+import {
+  InstrumentationBase,
+  InstrumentationNodeModuleDefinition,
+} from '../../build/src/index.js';
+
+describe('when loading esm module', () => {
+  it('should patch module file', async () => {
+    class TestInstrumentation extends InstrumentationBase {
+      constructor() {
+        super('test-esm-instrumentation', '0.0.1');
+      }
+      init() {
+        console.log('test-esm-instrumentation initialized!');
+        return new InstrumentationNodeModuleDefinition(
+          'test-esm-module',
+          ['*'],
+          moduleExports => {
+            console.log('patch');
+            moduleExports.testConstant = 43;
+          }
+        );
+      }
+    }
+    const instrumentation = new TestInstrumentation();
+    instrumentation.enable();
+    // const exported = await import('test-esm-module');
+    // assert.deepEqual(exported.testConstant, 43);
+
+    // error from import-in-the-middle register
+    // TypeError: setters.get(...)[name] is not a function
+  });
+});