public void Peek_PushTwoItems_ReturnsHeadItem()
{
var stack = new MyStack <int>();
stack.Push(1);
stack.Push(2);
Assert.AreEqual(2, stack.Peek());
}
public void Peek_PushTwoItemsAndPop_ReturnsHeadElement()
{
var stack = new MyStack <int>();
stack.Push(1);
stack.Push(2);
stack.Pop();
Assert.AreEqual(1, stack.Peek());
}
public void TestStack()
{
Stack <int> stdStack = new Stack <int>(); // standard queue implemented by C#
MyStack <int> ourStack = new MyStack <int>(); // our manually implemented stack
// Test generates 100 random integers and adds to both queues
Random r = new Random();
for (int i = 0; i < 100; i++)
{
int randVal = r.Next();
stdStack.Push(randVal);
ourStack.Push(randVal);
}
// Test reading back half the added integers
for (int i = 0; i < 50; i++)
{
Assert.AreEqual(stdStack.Pop(), ourStack.Pop());
Assert.AreEqual(stdStack.Peek(), ourStack.Peek());
Assert.AreEqual(stdStack.Count, ourStack.Count());
}
// Test adding 50 more random integers
for (int i = 0; i < 50; i++)
{
int randVal = r.Next();
stdStack.Push(randVal);
ourStack.Push(randVal);
}
// Test reading back all the remaining values
for (int i = 0; i < 100; i++)
{
Assert.AreEqual(stdStack.Peek(), ourStack.Peek());
Assert.AreEqual(stdStack.Pop(), ourStack.Pop());
Assert.AreEqual(stdStack.Count, ourStack.Count());
}
}