LRUCacheTests.cs

        [Fact]
        public async Task multiple_threads_should_get_data_correctly()
        {
            LRUCache<int> cache = new LRUCache<int>(3);
            
            Task[] tasks = new[] {
                Task.Run(() => cache.Set(1, 3)),
                Task.Run(() => cache.Set(1, 3)),
                Task.Run(() => cache.Set(1, 3))
            };

            await Task.WhenAll(tasks);
            Assert.NotNull(cache.Get(1));
        }