public async Task LruRemoveExpired()
{
const int n = 10;
const int maxSize = n * 2;
var maxAge = TimeSpan.FromMilliseconds(500);
LRU <string, string> .FetchValueDelegate f = null;
var flushCounter = 0;
var target = new LRU <string, string>(maxSize, maxAge, f);
target.RaiseFlushEvent += (object o, LRU <string, string> .FlushEventArgs args) => flushCounter++;
for (int i = 0; i < n; i++)
{
var s = i.ToString();
target.Add(s, $"item {s}");
}
target.RemoveExpired();
Assert.Equal(0, flushCounter);
Assert.Equal(n, target.Count);
await Task.Delay(maxAge.Add(maxAge));
target.Add("expected", "value");
target.RemoveExpired();
Assert.Equal(n, flushCounter);
Assert.Equal(1, target.Count);
Assert.True(target.TryGetValue("expected", out var value));
Assert.Equal("value", value);
}
