public void WhenLookupCachedItem_ThenItemIsReturned()
{
var cache = new LeastRecentlyUsedCache <string, string>(2);
cache.Add("one", "ONE");
cache.Add("two", "TWO");
Assert.AreEqual("ONE", cache.Lookup("one"));
Assert.AreEqual("TWO", cache.Lookup("two"));
}
public void WhenItemAddedTwice_ThenSecondCallIsIgnored()
{
var cache = new LeastRecentlyUsedCache <string, string>(2);
cache.Add("one", "ONE");
cache.Add("one", "ONE");
cache.Add("two", "TWO");
Assert.AreEqual("ONE", cache.Lookup("one"));
Assert.AreEqual("TWO", cache.Lookup("two"));
}
public void WhenAddingItemsBeyondCapacity_ThenLeastReentlyUsedItemIsPurged()
{
var cache = new LeastRecentlyUsedCache <string, string>(2);
cache.Add("one", "ONE");
cache.Add("two", "TWO");
cache.Add("three", "THREE");
Assert.IsNull(cache.Lookup("one"));
Assert.AreEqual("TWO", cache.Lookup("two"));
Assert.AreEqual("THREE", cache.Lookup("three"));
}
public void WhenLookingUpItem_ThenItemIsMarkedAsUsed()
{
var cache = new LeastRecentlyUsedCache <string, string>(2);
cache.Add("one", "ONE");
cache.Add("two", "TWO");
cache.Lookup("one");
cache.Add("three", "THREE");
Assert.IsNull(cache.Lookup("two"));
Assert.AreEqual("ONE", cache.Lookup("one"));
Assert.AreEqual("THREE", cache.Lookup("three"));
}
public void WhenItemExists_ThenRemoveSucceeds()
{
var cache = new LeastRecentlyUsedCache <string, string>(2);
cache.Add("one", "ONE");
cache.Remove("one");
cache.Remove("doesnotexist");
Assert.IsNull(cache.Lookup("one"));
}
public void WhenLookupNonexistingItem_ThenNullIsReturned()
{
var cache = new LeastRecentlyUsedCache <string, string>(2);
Assert.IsNull(cache.Lookup("key"));
}