public void Test_Utils_DoubleBufferCache()
{
TestEnv.LogTestMethodStart();
var cache = new DoubleBufferCache <string, string>(capacity: 20, evictionTimeSec: 10);
// fill out 10 items
for (int i = 0; i < 10; i++)
{
cache.Add($"Key-{i}", $"Value-{i}");
}
// read 20 items, 10 must be in cache
var hits = 0;
var misses = 0;
for (int i = 0; i < 20; i++)
{
if (cache.TryLookup($"Key-{i}", out _))
{
hits++;
}
else
{
misses++;
}
}
// check that we have 10 hits and 10 misses
Assert.AreEqual(10, hits, "Invalid hit count");
Assert.AreEqual(10, misses, "Invalid miss count");
// move time forward, and add item that is already there. this will force swapping buffers
// and finalizing metrics record
AppTime.SetOffset(TimeSpan.FromSeconds(30));
cache.Add("Key-0", "Value-0");
// check metrics
var metrics = cache.GetMetrics();
Assert.AreEqual(10, metrics.ItemCount);
Assert.AreEqual(20, metrics.ReadCount);
Assert.AreEqual(10, metrics.MissCount);
AppTime.ClearOffset();
}
public void Cleanup()
{
AppTime.ClearOffset(); //make sure there's no time shift when test is completed
}