public void Unset_should_not_decrement_counter_if_counter_is_zeroed()
        {
            var monitor = new SimpleMonitor();

            monitor.Unset();

            monitor.Counter.Should().Be(0);
        }
        public void Unset_should_decrement_counter()
        {
            var monitor = new SimpleMonitor();

            monitor.Set();

            monitor.Unset();

            monitor.Counter.Should().Be(0);
        }