add pack-n-play tests

package.json

@@ -122,6 +122,7 @@
     "mockery": "^2.1.0",
     "nock": "~13.3.0",
     "node-fetch": "^2.6.7",
+    "pack-n-play": "^2.0.0",
     "proxyquire": "^2.1.3",
     "sinon": "^16.0.0",
     "tmp": "^0.2.0",

system-test/fixtures/index-cjs.js

@@ -0,0 +1,22 @@
+// Copyright 2023 Google LLC
+//
+// 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.
+
+/* eslint-disable node/no-missing-require, no-unused-vars, no-undef */
+const {Storage} = require('@google-cloud/storage');
+
+function main() {
+  const storage = new Storage();
+}
+
+main();

system-test/fixtures/index-esm.js

@@ -0,0 +1,22 @@
+// Copyright 2023 Google LLC
+//
+// 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.
+
+/* eslint-disable node/no-missing-import, no-unused-vars */
+import {Storage} from '@google-cloud/storage';
+
+function main() {
+  const storage = new Storage();
+}
+
+main();

system-test/install.ts

@@ -0,0 +1,37 @@
+// Copyright 2023 Google LLC
+//
+// 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 {packNTest} from 'pack-n-play';
+import {readFileSync} from 'fs';
+import {describe, it} from 'mocha';
+
+describe('pack-n-play tests', () => {
+  it('ESM module', async () => {
+    await packNTest({
+      sample: {
+        description: 'Should be able to import the storage library in ESM',
+        esm: readFileSync('./system-test/fixtures/index-esm.js').toString(),
+      },
+    });
+  });
+
+  it('CJS module', async () => {
+    await packNTest({
+      sample: {
+        description: 'Should be able to import the storage library in CJS',
+        cjs: readFileSync('./system-test/fixtures/index-cjs.js').toString(),
+      },
+    });
+  });
+});