Show "unplayed" dot on incoming audio messages

ts/test-both/messages/MessageReadStatus_test.ts

@@ -0,0 +1,50 @@
+// Copyright 2021 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import { assert } from 'chai';
+
+import { ReadStatus, maxReadStatus } from '../../messages/MessageReadStatus';
+
+describe('message read status utilities', () => {
+  describe('maxReadStatus', () => {
+    it('returns the status if passed the same status twice', () => {
+      assert.strictEqual(
+        maxReadStatus(ReadStatus.Unread, ReadStatus.Unread),
+        ReadStatus.Unread
+      );
+    });
+
+    it('sorts Unread < Read', () => {
+      assert.strictEqual(
+        maxReadStatus(ReadStatus.Unread, ReadStatus.Read),
+        ReadStatus.Read
+      );
+      assert.strictEqual(
+        maxReadStatus(ReadStatus.Read, ReadStatus.Unread),
+        ReadStatus.Read
+      );
+    });
+
+    it('sorts Read < Viewed', () => {
+      assert.strictEqual(
+        maxReadStatus(ReadStatus.Read, ReadStatus.Viewed),
+        ReadStatus.Viewed
+      );
+      assert.strictEqual(
+        maxReadStatus(ReadStatus.Viewed, ReadStatus.Read),
+        ReadStatus.Viewed
+      );
+    });
+
+    it('sorts Unread < Viewed', () => {
+      assert.strictEqual(
+        maxReadStatus(ReadStatus.Unread, ReadStatus.Viewed),
+        ReadStatus.Viewed
+      );
+      assert.strictEqual(
+        maxReadStatus(ReadStatus.Viewed, ReadStatus.Unread),
+        ReadStatus.Viewed
+      );
+    });
+  });
+});