test(NODE-6288): test that container and FAAS env information are both included in handshake

test/integration/mongodb-handshake/mongodb-handshake.prose.test.ts

@@ -1,7 +1,13 @@
 import { expect } from 'chai';
 import * as sinon from 'sinon';
 
-import { Connection, getFAASEnv, LEGACY_HELLO_COMMAND, type MongoClient } from '../../mongodb';
+import {
+  Connection,
+  getFAASEnv,
+  Int32,
+  LEGACY_HELLO_COMMAND,
+  type MongoClient
+} from '../../mongodb';
 describe('Handshake Prose Tests', function () {
   let client: MongoClient;
 
@@ -110,6 +116,49 @@ describe('Handshake Prose Tests', function () {
     });
   }
 
+  context('Test 9: Valid container and FaaS provider', function () {
+    const env = [
+      ['AWS_EXECUTION_ENV', 'AWS_Lambda_java8'],
+      ['AWS_REGION', 'us-east-2'],
+      ['AWS_LAMBDA_FUNCTION_MEMORY_SIZE', '1024'],
+      ['KUBERNETES_SERVICE_HOST', '1']
+    ] as EnvironmentVariables;
+    before(() => {
+      for (const [key, value] of env) {
+        process.env[key] = value;
+      }
+    });
+    after(() => {
+      for (const [key] of env) {
+        delete process.env[key];
+      }
+    });
+
+    it('runs a hello successfully', async function () {
+      client = this.configuration.newClient({
+        // if the handshake is not truncated, the `hello`s fail and the client does
+        // not connect.  Lowering the server selection timeout causes the tests
+        // to fail more quickly in that scenario.
+        serverSelectionTimeoutMS: 3000
+      });
+      await client.connect();
+    });
+
+    it('includes both container and FAAS provider information in the client metadata', async function () {
+      client = this.configuration.newClient();
+      await client.connect();
+      expect(client.topology?.s.options.extendedMetadata).to.exist;
+      const { env } = await client.topology.s.options.extendedMetadata;
+
+      expect(env).to.deep.equal({
+        region: 'us-east-2',
+        name: 'aws.lambda',
+        memory_mb: new Int32(1024),
+        container: { orchestrator: 'kubernetes' }
+      });
+    });
+  });
+
   context(`Test 2: Test that the driver accepts an arbitrary auth mechanism`, function () {
     let stubCalled = false;
     beforeEach(() => {