public void PruneCache_PruneCacheFolders_WillRemoveOldestFolders()
{
PopulateCache(out int filesWritten, out string[] artifactsDirectories);
BuildCache.ComputeCacheSizeAndFolders(out long currentCacheSize, out List <BuildCache.CacheFolder> cacheFolders);
// Set folder older
var folder = cacheFolders[0];
folder.LastAccessTimeUtc = folder.LastAccessTimeUtc.Subtract(new TimeSpan(1, 0, 0));
cacheFolders[0] = folder;
// delete just under the first folder size
long maximumCacheSize = currentCacheSize - folder.Length + 1;
BuildCache.PruneCacheFolders(maximumCacheSize, currentCacheSize, cacheFolders);
BuildCache.ComputeCacheSizeAndFolders(out long newCurrentCacheSize, out List <BuildCache.CacheFolder> newCacheFolders);
Assert.AreNotEqual(0, newCurrentCacheSize);
Assert.GreaterOrEqual(maximumCacheSize, newCurrentCacheSize);
Assert.AreEqual(artifactsDirectories.Length - 1, newCacheFolders.Count);
}