public void ClearHeap()
{
var heap = new MinMaxHeap <double>(2, Comparer <double> .Default);
Assert.Equal(heap.Count, 0);
heap.Push(Math.E);
Assert.Equal(heap.Count, 1);
heap.Clear();
Assert.Equal(heap.Count, 0);
heap.Push(Math.PI);
Assert.Equal(heap.Minimum, Math.PI);
}
public void HeapCapacity()
{
var heap = new MinMaxHeap <double>(1, Comparer <double> .Default);
Assert.True(heap.Capacity == 1);
Assert.True(heap.Count == 0);
heap.Push(Math.PI);
Assert.True(heap.Capacity == 1);
Assert.True(heap.Count == 1);
Assert.ThrowsAny <Exception>(() =>
{
heap.Push(Math.E);
});
Assert.True(heap.Capacity == 1);
Assert.True(heap.Count == 1);
}
public void SingleItemHeapOperations()
{
var heap = new MinMaxHeap <double>(1, Comparer <double> .Default);
Assert.Equal(heap.Count, 0);
heap.Push(Math.PI);
Assert.Equal(heap.Count, 1);
Assert.Equal(heap.Minimum, Math.PI);
Assert.Equal(heap.Maximum, Math.PI);
Assert.Equal(heap.PopMinimum(), Math.PI);
Assert.Equal(heap.Count, 0);
heap.Push(Math.E);
Assert.Equal(heap.Count, 1);
Assert.Equal(heap.PopMaximum(), Math.E);
Assert.Equal(heap.Count, 0);
}
public void PopCorrectness()
{
// Generate random values
var rng = new Random(1);
var values = new double[20];
for (var i = 0; i < values.Length; i++)
{
values[i] = -Math.Log(rng.NextDouble());
}
// Push them on the heap
var heap = new MinMaxHeap <double>(values.Length, Comparer <double> .Default);
foreach (var value in values)
{
heap.Push(value);
}
// Sort them, so we know what order they should come out in
Array.Sort(values);
// Pop elements and make sure they come out in that order
var minIndex = 0;
var maxIndex = values.Length - 1;
for (var i = 0; i < values.Length; i++)
{
Assert.Equal(heap.Count, values.Length - i);
Assert.Equal(heap.Minimum, values[minIndex]);
Assert.Equal(heap.Maximum, values[maxIndex]);
// Randomly pop either minimum or maximum
if (rng.NextDouble() < 0.5)
{
Assert.Equal(heap.PopMinimum(), values[minIndex]);
minIndex++;
}
else
{
Assert.Equal(heap.PopMaximum(), values[maxIndex]);
maxIndex--;
}
}
}
public void PushOrderIrrelevant()
{
double[] values = { 1.0, 2.0, 3.0, 4.0, 5.0 };
// Insert values in different orders, make sure
// resuts are same
var rng = new Random(1);
for (var i = 0; i < 10; i++)
{
// Shuffle values
for (var j = 0; j < values.Length; j++)
{
var k = rng.Next(j, values.Length);
var t = values[j];
values[j] = values[k];
values[k] = t;
}
// Push in shuffled order
var heap = new MinMaxHeap <double>(values.Length, Comparer <double> .Default);
foreach (var value in values)
{
heap.Push(value);
}
// Pop order should always be same
Assert.Equal(heap.Count, 5);
Assert.Equal(heap.PopMinimum(), 1.0);
Assert.Equal(heap.PopMaximum(), 5.0);
Assert.Equal(heap.PopMaximum(), 4.0);
Assert.Equal(heap.PopMinimum(), 2.0);
Assert.Equal(heap.PopMinimum(), 3.0);
Assert.Equal(heap.Count, 0);
}
}
