public void DequeueLastOnNonEmptyQueueShouldReturnLastElementAndDecreaseCountByOne()
{
Dequeue <int> queue = new Dequeue <int>();
queue.Enqueue(17);
queue.Enqueue(42);
Assert.AreEqual(2, queue.Count, "Count should be 2 after enqueue");
Assert.IsFalse(queue.IsEmpty, "Queue should not be empty after enqueue");
int value = queue.DequeueLast();
Assert.AreEqual(42, value, "dequeued value should be 42");
Assert.AreEqual(1, queue.Count, "Count should be 1 after dequeue");
Assert.IsFalse(queue.IsEmpty, "Queue should not be empty as count > 0");
value = queue.DequeueLast();
Assert.AreEqual(17, value, "dequeued value should be 17");
Assert.AreEqual(0, queue.Count, "Count should be 0 after dequeue");
Assert.IsTrue(queue.IsEmpty, "Queue should be empty as count = 0");
}
public void PeekLastOnNonEmptyQueueShouldReturnLastElementButNotChangeQueue()
{
Dequeue <int> queue = new Dequeue <int>();
queue.Enqueue(17);
int value = queue.PeekLast();
Assert.AreEqual(17, value, "Last value = 17");
Assert.AreEqual(1, queue.Count, "Count should be 1 after peek");
Assert.IsFalse(queue.IsEmpty, "Queue should not be empty as count > 0");
value = queue.PeekLast();
Assert.AreEqual(17, value, "Last value = 17");
Assert.AreEqual(1, queue.Count, "Count should be 1 after peek");
Assert.IsFalse(queue.IsEmpty, "Queue should not be empty as count > 0");
queue.Enqueue(42);
value = queue.PeekLast();
Assert.AreEqual(42, value, "Last value = 42");
Assert.AreEqual(2, queue.Count, "Count should be 2 after peek");
Assert.IsFalse(queue.IsEmpty, "Queue should not be empty as count > 0");
}
