chore: add cluster test for oauth

spec/cluster/public_oauth.spec.ts

@@ -0,0 +1,28 @@
+jest.setTimeout(15000);
+
+import twilio from "twilio";
+
+const clientId = process.env.TWILIO_CLIENT_ID;
+const clientSecret = process.env.TWILIO_CLIENT_SECRET;
+const accountSid = process.env.TWILIO_ACCOUNT_SID;
+
+const clientCredentialProvider = new twilio.ClientCredentialProviderBuilder()
+  .setClientId(clientId)
+  .setClientSecret(clientSecret)
+  .build();
+
+const client = twilio();
+client.setCredentialProvider(clientCredentialProvider);
+client.setAccountSid(accountSid);
+
+test("Should fetch message", () => {
+  const messageId = process.env.TWILIO_MESSAGE_SID;
+  return client
+    .messages(messageId)
+    .fetch()
+    .then((message) => {
+      expect(message).not.toBeNull();
+      expect(message).not.toBeUndefined();
+      expect(message.sid).toEqual(messageId);
+    });
+});