Nuclex.Support/Source/Collections/PriorityQueue.Test.cs

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#region CPL License
/*
Nuclex Framework
Copyright (C) 2002-2009 Nuclex Development Labs
This library is free software; you can redistribute it and/or
modify it under the terms of the IBM Common Public License as
published by the IBM Corporation; either version 1.0 of the
License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
IBM Common Public License for more details.
You should have received a copy of the IBM Common Public
License along with this library
*/
#endregion
using System;
using System.Collections.Generic;
#if UNITTEST
using NUnit.Framework;
namespace Nuclex.Support.Collections {
/// <summary>Unit Test for the priority queue class</summary>
[TestFixture]
public class PriorityQueueTest {
#region class FloatComparer
/// <summary>Comparer for two floating point values</summary>
private class FloatComparer : IComparer<float> {
/// <summary>The default instance of this comparer</summary>
public static readonly FloatComparer Default = new FloatComparer();
/// <summary>Compares two floating points against each other</summary>
/// <param name="left">First float to compare</param>
/// <param name="right">Second float to compare</param>
/// <returns>The relationship of the two floats to each other</returns>
public int Compare(float left, float right) {
return Math.Sign(left - right);
}
}
#endregion // class FloatComparer
/// <summary>Tests to ensure the count property is properly updated</summary>
[Test]
public void TestCount() {
PriorityQueue<float> testQueue = new PriorityQueue<float>(FloatComparer.Default);
Assert.AreEqual(0, testQueue.Count);
testQueue.Enqueue(12.34f);
Assert.AreEqual(1, testQueue.Count);
testQueue.Enqueue(56.78f);
Assert.AreEqual(2, testQueue.Count);
testQueue.Dequeue();
Assert.AreEqual(1, testQueue.Count);
testQueue.Enqueue(9.0f);
Assert.AreEqual(2, testQueue.Count);
testQueue.Clear();
Assert.AreEqual(0, testQueue.Count);
}
/// <summary>Tests to ensure that the priority collection actually sorts items</summary>
[Test]
public void TestOrdering() {
PriorityQueue<float> testQueue = new PriorityQueue<float>(FloatComparer.Default);
testQueue.Enqueue(1.0f);
testQueue.Enqueue(9.0f);
testQueue.Enqueue(2.0f);
testQueue.Enqueue(8.0f);
testQueue.Enqueue(3.0f);
testQueue.Enqueue(7.0f);
testQueue.Enqueue(4.0f);
testQueue.Enqueue(6.0f);
testQueue.Enqueue(5.0f);
Assert.AreEqual(9.0f, testQueue.Dequeue());
Assert.AreEqual(8.0f, testQueue.Dequeue());
Assert.AreEqual(7.0f, testQueue.Dequeue());
Assert.AreEqual(6.0f, testQueue.Dequeue());
Assert.AreEqual(5.0f, testQueue.Dequeue());
Assert.AreEqual(4.0f, testQueue.Dequeue());
Assert.AreEqual(3.0f, testQueue.Dequeue());
Assert.AreEqual(2.0f, testQueue.Dequeue());
Assert.AreEqual(1.0f, testQueue.Dequeue());
}
#if DEBUG
/// <summary>
/// Tests whether the priority queue's enumerators are invalidated when the queue's
/// contents are modified
/// </summary>
[Test]
public void TestEnumeratorInvalidationOnModify() {
PriorityQueue<int> testQueue = new PriorityQueue<int>();
IEnumerator<int> testQueueEnumerator = testQueue.GetEnumerator();
testQueue.Enqueue(123);
Assert.Throws<InvalidOperationException>(
delegate() { testQueueEnumerator.MoveNext(); }
);
}
#endif
/// <summary>
/// Verifies that an exception is thrown when Peek() is called on an empty queue
/// </summary>
[Test]
public void TestPeekEmptyQueue() {
PriorityQueue<int> testQueue = new PriorityQueue<int>();
Assert.Throws<InvalidOperationException>(
delegate() { testQueue.Peek(); }
);
}
/// <summary>
/// Verifies that an exception is thrown when Dequeue() is called on an empty queue
/// </summary>
[Test]
public void TestDequeueEmptyQueue() {
PriorityQueue<int> testQueue = new PriorityQueue<int>();
Assert.Throws<InvalidOperationException>(
delegate() { testQueue.Dequeue(); }
);
}
/// <summary>
/// Verifies that the priority queue can handle large amounts of data
/// </summary>
[Test]
public void TestLargeQueue() {
PriorityQueue<int> testQueue = new PriorityQueue<int>();
List<int> testList = new List<int>();
for(int index = 0; index < 1000; ++index) {
testQueue.Enqueue(index * 2);
testList.Add(index * 2);
}
CollectionAssert.AreEquivalent(testList, testQueue);
}
}
} // namespace Nuclex.Support.Collections
#endif // UNITTEST