diff --git a/packages/core/src/test/shared/awsClientBuilderV3.test.ts b/packages/core/src/test/shared/awsClientBuilderV3.test.ts
index dc577f33bce..7cff0dd2f23 100644
--- a/packages/core/src/test/shared/awsClientBuilderV3.test.ts
+++ b/packages/core/src/test/shared/awsClientBuilderV3.test.ts
@@ -4,6 +4,7 @@
  */
 import sinon from 'sinon'
 import assert from 'assert'
+import http from 'http'
 import { version } from 'vscode'
 import { getClientId } from '../../shared/telemetry/util'
 import { FakeMemento } from '../fakeExtensionContext'
@@ -32,6 +33,7 @@ import { Credentials, MetadataBearer, MiddlewareStack } from '@aws-sdk/types'
 import { oneDay } from '../../shared/datetime'
 import { ConfiguredRetryStrategy } from '@smithy/util-retry'
 import { StandardRetryStrategy } from '@smithy/util-retry'
+import { DescribeSessionsCommand, SSMClient } from '@aws-sdk/client-ssm'
 
 describe('AwsClientBuilderV3', function () {
     let builder: AWSClientBuilderV3
@@ -318,6 +320,38 @@ describe('recordErrorTelemetry', function () {
     })
 })
 
+describe('connection reuse', function () {
+    it('reuses connections', async function () {
+        const port = 3000
+        const server = http.createServer((req, rsp) => {
+            rsp.writeHead(200, { 'Content-Type': 'application/json' })
+            rsp.end(JSON.stringify({ message: 'success' }))
+        })
+        try {
+            server.listen(port, () => {})
+            const config = {
+                region: 'us-east-1',
+                endpoint: `http://localhost:${port}`,
+                // requestHandler: new NodeHttpHandler({
+                //     httpAgent: new Agent({ keepAlive: true }),
+                // }),
+            }
+            const client = new SSMClient(config)
+            const requests: http.IncomingMessage[] = []
+            server.on('request', (req) => {
+                requests.push(req)
+            })
+            await client.send(new DescribeSessionsCommand({ State: 'Active' }))
+            await client.send(new DescribeSessionsCommand({ State: 'Active' }))
+
+            assert.strictEqual(requests[0].headers.connection, 'keep-alive')
+            assert.strictEqual(requests.length, 1)
+        } finally {
+            server.close()
+        }
+    })
+})
+
 class MockCredentialsShim implements CredentialsShim {
     public constructor(
         public credentials: Credentials,