public void Ctor_01()
 {
     Assert.DoesNotThrow(() =>
     {
         cache = new LruCache <int, int>(0);
         cache.Insert(0, 0);
         Assert.IsFalse(cache.HasKey(0));
     });
 }
 public void Get_01()
 {
     cache.Insert(-1, -1);
     for (int i = 0; i < capacity; i++)
     {
         cache.Insert(i, i);
     }
     Assert.IsFalse(cache.HasKey(-1));
 }