SafetyNumberChangeDialog: Introduce awareness of stories

ts/test-both/util/waitForAll.ts

@@ -0,0 +1,20 @@
+// Copyright 2022 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import { assert } from 'chai';
+import { waitForAll } from '../../util/waitForAll';
+
+describe('util/waitForAll', () => {
+  it('returns result of provided tasks', async () => {
+    const task1 = () => Promise.resolve(1);
+    const task2 = () => Promise.resolve(2);
+    const task3 = () => Promise.resolve(3);
+
+    const result = await waitForAll({
+      tasks: [task1, task2, task3],
+      maxConcurrency: 1,
+    });
+
+    assert.deepEqual(result, [1, 2, 3]);
+  });
+});