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

            monitor.Set();

            monitor.IsSet.Should().BeTrue();
        }
        public void Set_should_increment_counter()
        {
            var monitor = new SimpleMonitor();

            monitor.Set();

            monitor.Counter.Should().Be(1);
        }
        public void Dispose_shoud_decrement_counter()
        {
            var monitor = new SimpleMonitor();

            monitor.Set();

            monitor.Dispose();

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

            monitor.Set();

            monitor.Unset();

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