public void AchievementIncrementForUnmappedId()
        {
            var mockClient = new AchievementClient();
            var platform   = new PlayGamesPlatform(mockClient);

            platform.SetStepsAtLeast("unmapped", 20, SentinelCallback);

            Assert.AreEqual("unmapped", mockClient.IncrementedId);
            Assert.AreEqual(20, mockClient.NewSteps);
            Assert.AreSame(SentinelCallback, mockClient.IncrementedCallback);
        }