public void Test()
{
Assert.That(Singleton.IsInitialized, Is.False);
var singleton1 = Singleton.Accessor();
Assert.That(Singleton.IsInitialized, Is.True);
Assert.That(singleton1, Is.Not.Null);
var singleton2 = Singleton.Accessor();
Assert.That(singleton2, Is.Not.Null);
Assert.That(singleton1, Is.SameAs(singleton2));
}