public void StoreAndGet()
        {
            var ds = new NullDataStore();

            Assert.That(ds.StoreAsync("key", "value").IsCompleted, Is.True);
            var task = ds.GetAsync <string>("key");

            Assert.That(task.IsCompleted, Is.True);
            Assert.That(task.Result, Is.Null);
        }
        public void Delete()
        {
            var ds = new NullDataStore();

            Assert.That(ds.DeleteAsync <string>("key").IsCompleted, Is.True);
        }
        public void Clear()
        {
            var ds = new NullDataStore();

            Assert.That(ds.ClearAsync().IsCompleted, Is.True);
        }