public void SwapElements()
{
// Create a new heap.
ConcurrentBinaryMinHeap <int> heap = new ConcurrentBinaryMinHeap <int>();
// Enqueue an element into the queue.
var elem1 = new PriorityValuePair <int>(2f, 4);
heap.Push(elem1);
// Ensure that the element was inserted.
Assert.That(heap.Count, Is.EqualTo(1));
Assert.That(heap.Peek(), Is.EqualTo(elem1));
// Try to HeapSwapElements() while the queue only contains 1 element and expect an
// InvalidOperationException to be thrown.
Assert.Throws <InvalidOperationException>(() => {
heap.SwapElements(0, 1);
});
// Enqueue another element with higher priority than the last.
var elem2 = new PriorityValuePair <int>(1f, 2);
heap.Push(elem2);
// Ensure that the element was inserted and that the 1st (higher priority) element is
// still at the root of the heap.
Assert.That(heap.Count, Is.EqualTo(2));
Assert.That(heap.Peek(), Is.EqualTo(elem1));
// Try to HeapSwapElements() with an invalid index1 and expect an
// ArgumentOutOfRangeException to be thrown.
Assert.Throws <ArgumentOutOfRangeException>(() => {
heap.SwapElements(-1, 1);
});
// Try to HeapSwapElements() with an invalid index2 and expect an
// ArgumentOutOfRangeException to be thrown.
Assert.Throws <ArgumentOutOfRangeException>(() => {
heap.SwapElements(0, -1);
});
// Actually swap elements now.
heap.SwapElements(0, 1);
// Ensure that the elements were swapped.
Assert.That(heap.Count, Is.EqualTo(2));
Assert.That(heap.Peek(), Is.EqualTo(elem2));
Assert.That(heap.Contains(elem1), Is.True);
}
