public void ShouldAddRemoveTwoItemsOfEqualPriorty()
{
var queue = new PathPriorityQueue();
var item = new PathItem();
var item2 = new PathItem();
queue.Enqueue(item);
queue.Enqueue(item2);
Assert.AreEqual(2, queue.Count);
Assert.AreSame(queue.Pop(), item);
Assert.AreSame(queue.Pop(), item2);
Assert.AreEqual(0, queue.Count);
}
public void ShouldAddRemoveTwoItemsWithDifferentPriorty()
{
var queue = new PathPriorityQueue();
var item = new PathItem {
TotalCost = 1
};
var item2 = new PathItem {
TotalCost = 0
};
queue.Enqueue(item);
queue.Enqueue(item2);
Assert.AreSame(queue.Pop(), item2);
Assert.AreSame(queue.Pop(), item);
}
public void ShouldAddRemoveFiveItemsWithDifferentPriortyMoveToRoot()
{
var queue = new PathPriorityQueue();
queue.Enqueue(new PathItem {
TotalCost = 500
});
queue.Enqueue(new PathItem {
TotalCost = 500
});
queue.Enqueue(new PathItem {
TotalCost = 500
});
queue.Enqueue(new PathItem {
TotalCost = 500
});
queue.Enqueue(new PathItem {
TotalCost = 500
});
queue.Enqueue(new PathItem {
TotalCost = 0
});
queue.Enqueue(new PathItem {
TotalCost = 500
});
queue.Enqueue(new PathItem {
TotalCost = 500
});
Assert.AreEqual(0, queue.Pop().TotalCost);
}
public void ShouldBeAbleToUpdateCostAfterPop()
{
var queue = new PathPriorityQueue();
var item = new PathItem();
queue.Enqueue(item);
item.TotalCost = 2;
queue.Pop();
item.TotalCost = 5;
}
public void ShouldAddRemoveFiveItemsWithDifferentPriortyMoveToBase()
{
var queue = new PathPriorityQueue();
queue.Enqueue(new PathItem {
TotalCost = 0
});
queue.Enqueue(new PathItem {
TotalCost = 0
});
queue.Enqueue(new PathItem {
TotalCost = 0
});
var middleItem = new PathItem {
TotalCost = 0
};
queue.Enqueue(middleItem);
queue.Enqueue(new PathItem {
TotalCost = 0
});
queue.Enqueue(new PathItem {
TotalCost = 0
});
queue.Enqueue(new PathItem {
TotalCost = 0
});
queue.Enqueue(new PathItem {
TotalCost = 0
});
middleItem.TotalCost = 500;
while (queue.Count > 1)
{
Assert.AreEqual(0, queue.Pop().TotalCost);
}
Assert.AreEqual(500, queue.Pop().TotalCost);
}
public void ShouldUpdateToLowerPriorty()
{
var queue = new PathPriorityQueue();
var item = new PathItem {
TotalCost = 1
};
var item2 = new PathItem {
TotalCost = 0
};
queue.Enqueue(item);
queue.Enqueue(item2);
Assert.AreSame(queue.Peek(), item2);
item2.TotalCost = 1;
Assert.AreSame(queue.Peek(), item2);
item2.TotalCost = 2;
Assert.AreSame(queue.Pop(), item);
Assert.AreSame(queue.Pop(), item2);
}
public void ShouldAlwaysGetMin()
{
var queue = new PathPriorityQueue();
var items = new List <PathItem>();
var random = new Random();
for (var i = 0; i < 5000; i++)
{
var item = new PathItem {
TotalCost = random.Next(0, 100000)
};
items.Add(item);
queue.Enqueue(item);
}
for (var i = 0; i < 50; i++)
{
var min = items.OrderBy(x => x.TotalCost).First();
Assert.AreEqual(min.TotalCost, queue.Pop().TotalCost, $"Failed at index {i}.");
items.Remove(min);
}
for (var i = 0; i < 50; i++)
{
var item = items[i];
item.TotalCost = random.Next(0, 100000);
}
for (var i = 0; i < 20; i++)
{
var item = new PathItem {
TotalCost = random.Next(0, 100)
};
items.Add(item);
queue.Enqueue(item);
}
for (var i = 0; i < 4500; i++)
{
var min = items.OrderBy(x => x.TotalCost).First();
Assert.AreEqual(min.TotalCost, queue.Pop().TotalCost, $"Failed at index {i}.");
items.Remove(min);
}
for (var i = 0; i < 20; i++)
{
var item = items[i];
item.TotalCost = random.Next(0, 1000);
}
for (var i = 0; i < 20; i++)
{
var min = items.OrderBy(x => x.TotalCost).First();
Assert.AreEqual(min.TotalCost, queue.Pop().TotalCost, $"Failed at index {i}.");
items.Remove(min);
}
for (var i = 0; i < 400; i++)
{
var item = items[i];
item.TotalCost = random.Next(0, 100000);
}
for (var i = 0; i < 450; i++)
{
var min = items.OrderBy(x => x.TotalCost).First();
Assert.AreEqual(min.TotalCost, queue.Pop().TotalCost, $"Failed at index {i}.");
items.Remove(min);
}
Assert.AreEqual(0, queue.Count);
}