public void QueueWithLinkedList_Peek_should_throw_exception_when_queue_is_empty()
{
try
{
qu.Peek();
Assert.Fail();
}
catch (InvalidOperationException ex)
{
Assert.AreEqual("The queue is empty", ex.Message);
}
catch (Exception)
{
Assert.Fail();
}
}
private void Queue_Implementation_Using_Linkedlist_Click(object sender, EventArgs e)
{
QueueWithLinkedList list = new QueueWithLinkedList();
Console.WriteLine("Checking Is Empty - " + list.IsEmpty());
Console.WriteLine("Push 5 - "); list.Enqueue(5);
Console.WriteLine("Push 4 - "); list.Enqueue(4);
Console.WriteLine("Push 3 - "); list.Enqueue(3);
Console.WriteLine("Pop 5 - " + list.Dequeue().data);
Console.WriteLine("Peek 4 - " + list.Peek().data);
Console.WriteLine("Pop 4 - " + list.Dequeue().data);
Console.WriteLine("Checking Is Empty - " + list.IsEmpty());
Console.WriteLine("Pop 3 - " + list.Dequeue().data);
Console.WriteLine("Checking Is Empty - " + list.IsEmpty());
}
public void Peek_WhenQueueIsEmpty_ShouldThrowInvalidOperationException()
{
// Arrange & Act & Assert
Assert.Throws <InvalidOperationException>(() => _queue.Peek());
}
