public void Heaps_should_be_merged_correctly(HeapConfiguration conf)
{
var iterations = conf.CalculateIterations(5000);
for (var seed = 0; seed < iterations; ++seed)
{
// Arrange
var random = new Random(seed);
var keys1 = conf.GenerateKeys(random);
var secondHeapSize = random.Next(conf.HeapSize / 2, conf.HeapSize * 2);
var keys2 = conf.GenerateKeys(random, secondHeapSize);
var heap1 = CreateHeapInstance();
var heap2 = CreateHeapInstance();
foreach (var key in keys1)
{
heap1.Add(key, Guid.NewGuid().ToString());
}
foreach (var key in keys2)
{
heap2.Add(key, Guid.NewGuid().ToString());
}
var mixedKeys = keys1.Concat(keys2).ToList();
// Arrange
heap1.Merge(heap2);
// Assert
this.Pop_until_empty(heap1, mixedKeys);
}
}
public void Heap_enumeration_should_yield_all_elements(HeapConfiguration conf)
{
var iterations = conf.CalculateIterations(1000);
for (var seed = 0; seed < iterations; ++seed)
{
// Arrange
var random = new Random(seed);
var keys = conf.GenerateKeys(random);
var heap = CreateHeapInstance();
var handles = keys
.Select(k => heap.Add(k, Guid.NewGuid().ToString()));
var expected = handles
.Select(x => new KeyValuePair <int, string>(x.Key, x.Value))
.OrderBy(x => x.Value)
.ToArray();
// Act
var actual = heap
.Select(x => new KeyValuePair <int, string>(x.Key, x.Value))
.OrderBy(x => x.Value)
.ToArray();
// Assert
Assert.True(expected.SequenceEqual(actual));
}
}
public void Elements_should_be_updated_correctly(HeapConfiguration conf)
{
for (var seed = 0; seed < 15; ++seed)
{
// Arrange
var random = new Random(seed);
var keys = conf.GenerateKeys(random);
var heap = CreateHeapInstance();
var handles = keys
.Select(k => new HandleKeyPair(heap.Add(k, Guid.NewGuid().ToString()), k))
.ToList();
for (var i = 0; i < 15000; ++i)
{
var handleIndex = random.Next(0, conf.HeapSize);
var newKey = random.Next(conf.KeyLimit);
var handle = handles[handleIndex];
// Act
heap.Update(handle.Node, newKey);
handles[handleIndex].Key = newKey;
// Assert
Assert.Equal(Peek(handles), heap.Peek().Key);
}
}
}
public void Top_should_be_properly_maintained_after_addition(HeapConfiguration conf)
{
var iterations = conf.CalculateIterations(15000);
for (var seed = 0; seed < iterations; ++seed)
{
// Arrange
var keys = conf.GenerateKeys(new Random(seed));
var heap = CreateHeapInstance();
var top = int.MaxValue;
var count = 0;
foreach (var key in keys)
{
if (key < top)
{
top = key;
}
// Act
heap.Add(key, Guid.NewGuid().ToString());
++count;
// Assert
Assert.Equal(top, heap.Peek().Key);
Assert.Equal(count, heap.Count);
}
}
}
public void Elements_should_be_removed_correctly(HeapConfiguration conf)
{
var iterations = conf.CalculateIterations(5000);
for (var seed = 0; seed < iterations; ++seed)
{
// Arrange
var random = new Random(seed);
var keys = conf.GenerateKeys(random);
for (var toRemove = 0; toRemove < conf.HeapSize; ++toRemove)
{
var heap = CreateHeapInstance();
var count = conf.HeapSize;
var handles = keys
.Select(k => new HandleKeyPair(heap.Add(k, Guid.NewGuid().ToString()), k))
.ToList();
// Act & Assert
// Part I - remove one node
Assert.Equal(Peek(handles), heap.Peek().Key);
Assert.Equal(count--, heap.Count);
heap.Remove(handles[toRemove].Node);
handles.RemoveAt(toRemove);
if (count == 0)
{
Assert.Throws <InvalidOperationException>(() => heap.Peek());
}
else
{
Assert.Equal(Peek(handles), heap.Peek().Key);
Assert.Equal(count, heap.Count);
}
// Part II - pop until empty
while (!heap.IsEmpty)
{
var min = handles.MinBy(x => x.Key);
handles.Remove(min);
Assert.Equal(min.Key, heap.Pop().Key);
Assert.Equal(--count, heap.Count);
}
Assert.True(heap.IsEmpty);
Assert.Equal(0, count);
}
}
}
public void Elements_should_be_popped_correctly(HeapConfiguration conf)
{
var iterations = conf.CalculateIterations(5000);
for (var seed = 0; seed < iterations; ++seed)
{
// Arrange
var keys = conf.GenerateKeys(new Random(seed));
var heap = CreateHeapInstance();
var count = 0;
foreach (var key in keys)
{
Assert.Equal(count, heap.Count);
heap.Add(key, Guid.NewGuid().ToString());
Assert.Equal(++count, heap.Count);
}
// Act & Assert
this.Pop_until_empty(heap, keys);
}
}
public void All_elements_should_be_removed_correctly(HeapConfiguration conf)
{
var iterations = conf.CalculateIterations(5000);
for (var seed = 0; seed < iterations; ++seed)
{
// Arrange
var random = new Random(seed);
var keys = conf.GenerateKeys(random);
var heap = CreateHeapInstance();
var count = conf.HeapSize;
var handles = keys
.Select(k => new HandleKeyPair(heap.Add(k, Guid.NewGuid().ToString()), k))
.ToList();
// Act & Assert
while (!heap.IsEmpty)
{
Assert.Equal(Peek(handles), heap.Peek().Key);
Assert.Equal(count, heap.Count);
var handle = handles[random.Next(count--)];
handles.Remove(handle);
heap.Remove(handle.Node);
if (count == 0)
{
Assert.Throws <InvalidOperationException>(() => heap.Peek());
}
else
{
Assert.Equal(Peek(handles), heap.Peek().Key);
Assert.Equal(count, heap.Count);
}
}
}
}
