diff --git a/ts/test-mock/messaging/sendSync_test.ts b/ts/test-mock/messaging/sendSync_test.ts
new file mode 100644
index 0000000000..eeb7740d74
--- /dev/null
+++ b/ts/test-mock/messaging/sendSync_test.ts
@@ -0,0 +1,93 @@
+// Copyright 2023 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import createDebug from 'debug';
+import Long from 'long';
+import { StorageState } from '@signalapp/mock-server';
+
+import type { App } from '../playwright';
+import * as durations from '../../util/durations';
+import { Bootstrap } from '../bootstrap';
+
+export const debug = createDebug('mock:test:sendSync');
+
+describe('sendSync', function (this: Mocha.Suite) {
+  this.timeout(durations.MINUTE);
+
+  let bootstrap: Bootstrap;
+  let app: App;
+
+  beforeEach(async () => {
+    bootstrap = new Bootstrap();
+    await bootstrap.init();
+    app = await bootstrap.link();
+  });
+
+  afterEach(async function (this: Mocha.Context) {
+    if (!bootstrap) {
+      return;
+    }
+
+    await bootstrap.maybeSaveLogs(this.currentTest, app);
+    await app.close();
+    await bootstrap.teardown();
+  });
+
+  it('processes a synd sync in a group', async () => {
+    const { contacts, desktop, phone } = bootstrap;
+
+    const window = await app.getWindow();
+
+    const members = contacts.slice(4);
+
+    const group = await phone.createGroup({
+      title: 'Mock Group',
+      members: [phone, ...members],
+    });
+
+    await phone.setStorageState(
+      StorageState.getEmpty()
+        .addGroup(group, { whitelisted: true })
+        .pinGroup(group)
+    );
+
+    debug('Send a group sync sent message from phone');
+    const messageBody = 'Hi everybody!';
+    const timestamp = bootstrap.getTimestamp();
+    const originalDataMessage = {
+      body: messageBody,
+      timestamp: Long.fromNumber(timestamp),
+      groupV2: {
+        masterKey: group.masterKey,
+        revision: group.revision,
+      },
+    };
+    const content = {
+      syncMessage: {
+        sent: {
+          timestamp: Long.fromNumber(timestamp),
+          message: originalDataMessage,
+          unidentifiedStatus: members.map(member => ({
+            destinationServiceId: member.device.aci,
+            destination: member.device.number,
+          })),
+        },
+      },
+    };
+    const sendOptions = {
+      timestamp,
+    };
+    await phone.sendRaw(desktop, content, sendOptions);
+
+    debug('opening conversation');
+    const leftPane = window.locator('#LeftPane');
+
+    await leftPane
+      .locator('.module-conversation-list__item--contact-or-conversation')
+      .first()
+      .click();
+
+    debug('checking for latest message');
+    await window.locator(`.module-message__text >> "${messageBody}"`).waitFor();
+  });
+});