public void ShowLeaderboardUIWorksWhenAuthenticatedAndUnmappedDefaultLeaderboard()
        {
            var mockClient = new LeaderboardClient();
            var platform   = new PlayGamesPlatform(mockClient);

            platform.SetDefaultLeaderboardForUI("default");

            platform.ShowLeaderboardUI();

            Assert.IsTrue(mockClient.UIShown);
            Assert.AreEqual("default", mockClient.ShownId);
        }