fix: gcp-metadata sample tests

packages/gcp-metadata/package.json

@@ -18,9 +18,9 @@
     "fix": "gts fix",
     "pretest": "npm run compile",
     "prepare": "npm run compile",
-    "samples-test": "npm run compile && cd samples/ && npm link ../ && npm i && npm test",
+    "samples-test": "npm link && cd samples/ && npm link ../ && npm test && cd ../",
     "presystem-test": "npm run compile",
-    "system-test": "npm run compile && c8 mocha --timeout 300000 build/system-test",
+    "system-test": "mocha build/system-test --timeout 600000",
     "test": "c8 mocha --timeout=5000 build/test",
     "docs": "jsdoc -c .jsdoc.js",
     "lint": "gts check",
@@ -60,8 +60,8 @@
     "gcx": "^2.0.27",
     "gts": "^6.0.2",
     "jsdoc": "^4.0.4",
-    "jsdoc-fresh": "^4.0.0",
-    "jsdoc-region-tag": "^3.0.0",
+    "jsdoc-fresh": "^5.0.0",
+    "jsdoc-region-tag": "^4.0.0",
     "linkinator": "^6.1.2",
     "mocha": "^11.1.0",
     "ncp": "^2.0.0",
@@ -74,4 +74,4 @@
     "node": ">=18"
   },
   "homepage": "https://github.com/googleapis/google-cloud-node-core/tree/main/packages/gcp-metadata"
-}
+}

packages/gcp-metadata/samples/test/test.js

@@ -0,0 +1,61 @@
+/**
+ * Copyright 2018 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
+ *
+ *      http://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.
+ */
+
+const {assert} = require('chai');
+const {describe, it, before, after} = require('mocha');
+const cp = require('child_process');
+const http = require('http');
+const {promisify} = require('util');
+
+const exec = promisify(cp.exec);
+
+function handleRequest(req, res) {
+  res.setHeader('Connection', 'close'); // Important to prevent hanging.
+  res.setHeader('Metadata-Flavor', 'Google');
+
+  if (req.url.includes('/instance')) {
+    res.end(JSON.stringify({id: 'mock-instance-id'}));
+  } else if (req.url.includes('/project')) {
+    res.end(JSON.stringify({projectId: 'mock-project-id'}));
+  } else {
+    // Handles the isAvailable() check which hits the root URL.
+    res.end('true');
+  }
+}
+
+describe('gcp-metadata samples', () => {
+  let server;
+  let port;
+
+  before(async () => {
+    // Start a local server to mock the metadata service.
+    server = http.createServer(handleRequest);
+    await promisify(server.listen.bind(server))(0);
+    port = server.address().port;
+  });
+
+  after(async () => {
+    await promisify(server.close.bind(server))();
+  });
+
+  it('should run the quickstart', async () => {
+    // Use process.execPath to ensure the same node executable is used to run the sample.
+    // This is more robust for CI/CD environments.
+    const command = `${process.execPath} quickstart.js`;
+    const {stdout} = await exec(command, {env: {GCE_METADATA_HOST: `localhost:${port}`}});
+    assert.match(stdout, /Is available: true/);
+  });
+});