public void Decrement_key_must_decrease()
{
string key = "decrementKey";
provider.Delete(key);
var timeOut = new TimeSpan(0, 0, 10);
long value = provider.Increment(key, timeOut, 4);
value.Should().Be(4);
value = provider.Decrement(key, 2);
value.Should().Be(2);
}