public void Delete_RootIsNull_ReturnsFalse()
{
var tree = new ScapegoatTree <int>();
var deleted = tree.Delete(1);
Assert.IsFalse(deleted);
}
public void Delete_KeyIsNotPresent_ReturnsFalse()
{
var tree = new ScapegoatTree <int>(1);
var deleted = tree.Delete(2);
Assert.IsFalse(deleted);
Assert.AreEqual(1, tree.Size);
}
public void Remove_KeyIsRootWithNoChildren_RemovesKey()
{
var tree = new ScapegoatTree <int>(1);
var deleted = tree.Delete(1);
Assert.IsTrue(deleted);
Assert.IsNull(tree.Root);
Assert.AreEqual(0, tree.Size);
}
public void Remove_KeyIsRootWithOneRightChild_RemovesKey()
{
var tree = new ScapegoatTree <int>(1);
var inserted = tree.Insert(2);
Assert.IsTrue(inserted);
var deleted = tree.Delete(1);
Assert.IsTrue(deleted);
Assert.AreEqual(1, tree.Size);
}
public void Remove_KeyIsPresent_RemovesKey()
{
var tree = new ScapegoatTree <int>(1);
var inserted = tree.Insert(2);
Assert.IsTrue(inserted);
var deleted = tree.Delete(2);
Assert.IsTrue(deleted);
Assert.AreEqual(1, tree.Size);
}
public void Delete_TreeIsUnbalanced_MaxSizeEqualsSize(int root, int[] keys, int candidate, double alpha)
{
var tree = new ScapegoatTree <int>(root, alpha);
tree.TreeIsUnbalanced += FailTreeIsUnbalanced;
foreach (var item in keys)
{
Assert.DoesNotThrow(() => tree.Insert(item));
}
tree.TreeIsUnbalanced -= FailTreeIsUnbalanced;
tree.Delete(candidate);
Assert.AreEqual(tree.Size, tree.MaxSize);
}
public void Delete_TreeIsUnbalanced_BalancesTree(int root, int[] keys, int[] candidates, double alpha)
{
var tree = new ScapegoatTree <int>(root, alpha);
tree.TreeIsUnbalanced += FailTreeIsUnbalanced;
foreach (var item in keys)
{
Assert.DoesNotThrow(() => tree.Insert(item));
}
tree.TreeIsUnbalanced -= FailTreeIsUnbalanced;
tree.TreeIsUnbalanced += PassTreeIsUnbalanced;
Assert.Throws <SuccessException>(() =>
{
foreach (var item in candidates)
{
tree.Delete(item);
}
});
}
