Add "new conversation" composer for direct messages

ts/test-both/util/isConversationUnread_test.ts

@@ -0,0 +1,46 @@
+// Copyright 2021 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import { assert } from 'chai';
+
+import { isConversationUnread } from '../../util/isConversationUnread';
+
+describe('isConversationUnread', () => {
+  it('returns false if both markedUnread and unreadCount are undefined', () => {
+    assert.isFalse(isConversationUnread({}));
+    assert.isFalse(
+      isConversationUnread({
+        markedUnread: undefined,
+        unreadCount: undefined,
+      })
+    );
+  });
+
+  it('returns false if markedUnread is false', () => {
+    assert.isFalse(isConversationUnread({ markedUnread: false }));
+  });
+
+  it('returns false if unreadCount is 0', () => {
+    assert.isFalse(isConversationUnread({ unreadCount: 0 }));
+  });
+
+  it('returns true if markedUnread is true, regardless of unreadCount', () => {
+    assert.isTrue(isConversationUnread({ markedUnread: true }));
+    assert.isTrue(isConversationUnread({ markedUnread: true, unreadCount: 0 }));
+    assert.isTrue(
+      isConversationUnread({ markedUnread: true, unreadCount: 100 })
+    );
+  });
+
+  it('returns true if unreadCount is positive, regardless of markedUnread', () => {
+    assert.isTrue(isConversationUnread({ unreadCount: 1 }));
+    assert.isTrue(isConversationUnread({ unreadCount: 99 }));
+    assert.isTrue(
+      isConversationUnread({ markedUnread: false, unreadCount: 2 })
+    );
+  });
+
+  it('returns true if both markedUnread is true and unreadCount is positive', () => {
+    assert.isTrue(isConversationUnread({ markedUnread: true, unreadCount: 1 }));
+  });
+});