public async Task Int_TryRemoveStateAsyncTest()
{
var instance = new MockActorStateManager();
await instance.TryAddStateAsync("existing", 6);
await instance.TryRemoveStateAsync("existing");
var result = await instance.TryGetStateAsync <int>("existing");
Assert.IsInstanceOfType(result, typeof(ConditionalValue <int>));
Assert.AreEqual(default(int), result.Value);
Assert.IsFalse(result.HasValue);
}