public void GivenRandomPopulatedTreeWhenGetPrevReturnsCorrectValue()
{
var tree = new VanEmdeBoasTree32();
var rand = new Random();
var list = new List <uint>();
for (int i = 0; i < 1 << 17; i++)
{
var elem = (uint)(rand.Next(1 << 30)) << 2 | (uint)(rand.Next(1 << 2));
list.Add(elem);
tree.Add(elem);
}
var arr = list.OrderByDescending(x => x).Distinct().ToArray();
if (arr[0] != uint.MaxValue)
{
Assert.True(tree.TryGetPrevious(uint.MaxValue, out uint res));
Assert.Equal(arr[0], res);
}
for (int i = 1; i < arr.Length - 1; i++)
{
if (arr[i - 1] - arr[i] > 1)
{
Assert.True(tree.TryGetPrevious((arr[i - 1] - arr[i]) / 2 + arr[i], out uint prev));
Assert.Equal(arr[i], prev);
}
Assert.True(tree.TryGetPrevious(arr[i - 1], out uint res));
Assert.Equal(arr[i], res);
}
Assert.False(tree.TryGetPrevious(arr[arr.Length - 1], out uint _));
}
public void GivenRandomPopulatedTreeWhenTryGetNextReturnsCorrectValue()
{
var tree = new VanEmdeBoasTree32();
var rand = new Random();
var list = new List <uint>();
for (int i = 0; i < 1 << 17; i++)
{
var elem = (uint)(rand.Next(1 << 30)) << 2 | (uint)(rand.Next(1 << 2));
list.Add(elem);
tree.Add(elem);
}
list.Sort();
var arr = list.OrderBy(x => x).Distinct().ToArray();
if (arr[0] != 0)
{
Assert.True(tree.TryGetNext(0, out uint res));
Assert.Equal(arr[0], res);
}
for (int i = 1; i < arr.Length - 1; i++)
{
if (arr[i] - arr[i - 1] > 1)
{
Assert.True(tree.TryGetNext((arr[i] - arr[i - 1]) / 2 + arr[i - 1], out uint next));
Assert.Equal(arr[i], next);
}
Assert.True(tree.TryGetNext(arr[i - 1], out uint res));
Assert.Equal(arr[i], res);
}
Assert.False(tree.TryGetNext(arr[arr.Length - 1], out uint _));
}
public void GivenVebTreeWhenAddSameNumberThenReturnFalse()
{
var tree = new VanEmdeBoasTree32();
for (uint i = 0; i < 1 << 17; i++)
{
Assert.True(tree.Add(i));
Assert.False(tree.Add(i));
}
tree = new VanEmdeBoasTree32();
for (uint i = (1 << 18) - 1; i > 0; i--)
{
Assert.True(tree.Add(i));
Assert.False(tree.Add(i));
}
}
public void GivenTreeWhenPopulateItThenCountReturnsAmountOfAddedElements()
{
var tree = new VanEmdeBoasTree32();
Assert.Equal(0U, tree.Count);
for (uint i = 0; i < 1 << 17; i++)
{
tree.Add(i);
Assert.Equal(i + 1, tree.Count);
}
}
public void GivenRandomCollectionWhenAddingElementsToTreeThenAddReturnsSameResultAsAddingToSet()
{
var tree = new VanEmdeBoasTree32();
var rand = new Random(1);
var set = new HashSet <uint>();
for (int i = 0; i < 1 << 17; i++)
{
var elem = (uint)(rand.Next(1 << 30)) << 2 | (uint)(rand.Next(1 << 2));
var add = set.Add(elem);
Assert.Equal(add, tree.Add(elem));
}
}
public void GivenFullVebTreeWhenRemoveNumberThenFindCantFindIt()
{
var tree = new VanEmdeBoasTree32();
for (uint i = 0; i < 1 << 17; i++)
{
tree.Add(i);
}
for (uint i = 0; i < 1 << 17; i++)
{
tree.Remove(i);
Assert.False(tree.Find(i));
}
for (uint i = 0; i < 1 << 17; i++)
{
tree.Add(i);
}
for (uint i = 0; i < 1 << 17; i++)
{
var toRemove = (1 << 17) - 1 - i;
tree.Remove(toRemove);
Assert.False(tree.Find(toRemove));
}
}
public void GivenVebTreePopulatedWithOddNumbersWhenFindReturnsCorrectValue()
{
var tree = new VanEmdeBoasTree32();
for (uint i = 0; i < 1 << 8; i++)
{
if (i % 2 == 1)
{
tree.Add(i);
}
}
for (uint i = 0; i < 1 << 8; i++)
{
Assert.Equal(i % 2 == 1, tree.Find(i));
}
}
public void GivenPopulatedVebTreeWhenFindThenAlwaysReturnTrue()
{
var tree = new VanEmdeBoasTree32();
var rand = new Random();
var set = new HashSet <uint>();
for (int i = 0; i < 1 << 10; i++)
{
var elem = (uint)(rand.Next(1 << 30)) << 2 | (uint)(rand.Next(1 << 2));
set.Add(elem);
tree.Add(elem);
}
foreach (var elem in set)
{
Assert.True(tree.Find(elem));
}
}
public void GivenRandomFilledTreeWhenRemoveThenMatchesArrayState()
{
var tree = new VanEmdeBoasTree32();
var rand = new Random();
var arr = new bool[1 << 17];
for (int i = 0; i < 1 << 7; i++)
{
var elem = (uint)rand.Next(1 << 17);
arr[elem] = true;
tree.Add(elem);
}
for (int i = 0; i < 1 << 7; i++)
{
var elem = (uint)rand.Next(1 << 17);
Assert.Equal(arr[elem], tree.Remove(elem));
arr[elem] = false;
}
}
public void GivenRandomFilledTreeWhenCallMaxAndMinThenReturnProperValues()
{
var tree = new VanEmdeBoasTree32();
var rand = new Random();
uint min = uint.MaxValue;
uint max = uint.MinValue;
for (int i = 0; i < 1000; i++)
{
var value = (uint)rand.Next();
if (min > value)
{
min = value;
}
if (max < value)
{
max = value;
}
tree.Add(value);
}
Assert.Equal(min, tree.Min);
Assert.Equal(max, tree.Max);
}