public void EmptyPolicy()
{
var policy = new PagePrefetchAndRetainPolicy();
var key = new PageKey(Guid.Empty, 1, ScreenWidth);
var context = new PageCacheContext(ScreenWidth, GetLibrary(0));
Assert.IsFalse(policy.MustRetain(key, context), "not retain with empty library");
var dict = GetCacheDict(0);
CollectionAssert.IsEmpty(policy.KeysToRemove(dict, context), "no keys exist");
dict = GetCacheDict(5);
CollectionAssert.AreEquivalent(dict.Keys, policy.KeysToRemove(dict, context), "return all keys");
CollectionAssert.IsEmpty(policy.PrefetchKeyOrder(context), "prefetch list empty");
}
public void Remove_KeepOtherItems()
{
var context = new PageCacheContext(ScreenWidth, GetLibrary(1));
var policy = new PagePrefetchAndRetainPolicy()
{
OtherItemsToKeepCount = 7
};
var dict = GetCacheDict(10);
var keysToRemove = policy.KeysToRemove(dict, context);
// Keeping 7 items, removing 3
Assert.AreEqual(3, keysToRemove.Count());
// Makes sure *oldest* ones are removed
Assert.AreEqual(BaseTime + TimeSpan.FromDays(0), dict[keysToRemove.ElementAt(2)].LastAccessTime);
Assert.AreEqual(BaseTime + TimeSpan.FromDays(1), dict[keysToRemove.ElementAt(1)].LastAccessTime);
Assert.AreEqual(BaseTime + TimeSpan.FromDays(2), dict[keysToRemove.ElementAt(0)].LastAccessTime);
// Must NOT retain those keys
foreach (var key in keysToRemove)
{
Assert.IsFalse(policy.MustRetain(key, context));
}
}