public void Logger2Test()
        {
            Logger2 instance1 = Logger2.GetInstance();
            Logger2 instance2 = Logger2.GetInstance();

            Assert.Same(instance1, instance1);
            instance1.Counter++;
            Assert.Equal(instance1.Counter, instance2.Counter);
            instance2.Counter++;
            Assert.Equal(instance1.Counter, instance2.Counter);
        }