diff --git a/build/buildpipeline/osx.groovy b/build/buildpipeline/osx.groovy
index 4b0a9ec8f1..5dfa3d8a48 100644
--- a/build/buildpipeline/osx.groovy
+++ b/build/buildpipeline/osx.groovy
@@ -1,2 +1,14 @@
 @Library('dotnet-ci') _
 
+// 'node' indicates to Jenkins that the enclosed block runs on a node that matches
+// the label 'windows-with-vs'
+simpleNode('OSX.1012.Amd64.Open') {
+    stage ('Checking out source') {
+        checkout scm
+    }
+    stage ('Build') {
+        def logFolder = getLogFolder()
+        def environment = "export ASPNETCORE_TEST_LOG_DIR=${WORKSPACE}/${logFolder}"
+        sh "${environment}&./build.sh -ci"
+    }
+}
diff --git a/clients/ts/signalr-protocol-msgpack/src/MessagePackHubProtocol.ts b/clients/ts/signalr-protocol-msgpack/src/MessagePackHubProtocol.ts
index eca2b163f5..269e003f4a 100644
--- a/clients/ts/signalr-protocol-msgpack/src/MessagePackHubProtocol.ts
+++ b/clients/ts/signalr-protocol-msgpack/src/MessagePackHubProtocol.ts
@@ -79,7 +79,7 @@ export class MessagePackHubProtocol implements IHubProtocol {
         }
 
         const msgpack = msgpack5();
-        const properties = msgpack.decode(new Buffer(input));
+        const properties = msgpack.decode(Buffer.from(input));
         if (properties.length === 0 || !(properties instanceof Array)) {
             throw new Error("Invalid payload.");
         }
diff --git a/clients/ts/signalr/tests/WebSocketTransport.test.ts b/clients/ts/signalr/tests/WebSocketTransport.test.ts
index 98996364fe..107cf88db2 100644
--- a/clients/ts/signalr/tests/WebSocketTransport.test.ts
+++ b/clients/ts/signalr/tests/WebSocketTransport.test.ts
@@ -6,7 +6,7 @@ import { TransferFormat } from "../src/ITransport";
 import { WebSocketTransport } from "../src/WebSocketTransport";
 import { VerifyLogger } from "./Common";
 import { TestMessageEvent } from "./TestEventSource";
-import { TestCloseEvent, TestEvent, TestWebSocket } from "./TestWebSocket";
+import { TestCloseEvent, TestErrorEvent, TestEvent, TestWebSocket } from "./TestWebSocket";
 
 describe("WebSocketTransport", () => {
     it("sets websocket binarytype to arraybuffer on Binary transferformat", async () => {
@@ -40,7 +40,7 @@ describe("WebSocketTransport", () => {
 
     it("connect fails if there is error during connect", async () => {
         await VerifyLogger.run(async (logger) => {
-            (global as any).ErrorEvent = TestEvent;
+            (global as any).ErrorEvent = TestErrorEvent;
             const webSocket = new WebSocketTransport(undefined, logger, true, TestWebSocket);
 
             let connectComplete: boolean = false;
@@ -56,7 +56,8 @@ describe("WebSocketTransport", () => {
             TestWebSocket.webSocket.onerror(new TestEvent());
 
             await expect(connectPromise)
-                .rejects;
+                .rejects
+                .toBeNull();
             expect(connectComplete).toBe(false);
         });
     });