public void Stack_Count_ReturnsZeroIfStackIsEmpty()
{
Stack stack = new Stack();
int expectedNumberOfItems = 0;
int stackCountValue = stack.Count();
Assert.AreEqual(expectedNumberOfItems, stackCountValue);
}
public void Stack_Count_ReturnsZeroIfPreviouslyPopulatedStackIsEmpty()
{
Stack stack = new Stack();
int expectedNumberOfItems = 0;
stack.Push("Some data");
stack.Pop();
int stackCountValue = stack.Count();
Assert.AreEqual(expectedNumberOfItems, stackCountValue);
}
public void Stack_Count_ReturnsCorrectNumberOfItems()
{
Stack stack = new Stack();
int expectedNumberOfItems = 4;
stack.Push("Data");
stack.Push("More data");
stack.Push("Even more data");
stack.Push("DATA");
int actualNumberOfItems = stack.Count();
Assert.AreEqual(expectedNumberOfItems, actualNumberOfItems);
}
public void Stack_Count_ReturnsCorrectNumberOfItemsAfterMultiplePops()
{
Stack stack = new Stack();
int expectedNumberOfItems = 2;
stack.Push("Data");
stack.Push("More data");
stack.Push("Even more data");
stack.Push("DATA");
stack.Push("DATAAA!!!!!");
stack.Pop();
stack.Pop();
stack.Pop();
int numberOfItemsAfterMultiplePops = stack.Count();
Assert.AreEqual(expectedNumberOfItems, numberOfItemsAfterMultiplePops);
}
public void Stack_Push_MultipleItemsToStackAfterMultiplePops()
{
Stack stack = new Stack();
int expectedStackCount = 3;
stack.Push("First item");
stack.Push("Second item");
stack.Push("Third item");
stack.Pop();
stack.Pop();
stack.Push("Hello");
stack.Push("Last item");
int actualStackCount = stack.Count();
Assert.AreEqual(expectedStackCount, actualStackCount);
}
public void Stack_Push_MultipleItemsToEmptyStack()
{
Stack stack = new Stack();
int expectedStackCount = 3;
stack.Push("First item");
stack.Push("Second item");
stack.Push("Third item");
int actualStackCount = stack.Count();
Assert.AreEqual(expectedStackCount, actualStackCount);
}
public void Stack_Push_ItemToPreviouslyPopulatedEmptyStack()
{
Stack stack = new Stack();
int expectedStackCount = 1;
stack.Push("This is a string :)");
stack.Push("This is another string :)");
stack.Pop();
stack.Pop();
stack.Push("Some data");
int actualStackCount = stack.Count();
Assert.AreEqual(expectedStackCount, actualStackCount);
}
public void Stack_Push_ItemToEmptyStack()
{
Stack stack = new Stack();
int expectedStackCount = 1;
stack.Push("This is a string :)");
int actualStackCount = stack.Count();
Assert.AreEqual(expectedStackCount, actualStackCount);
}
public void Stack_Pop_RemovesNodeFromStackWithOnlyOneNode()
{
Stack stack = new Stack();
int expectedCount = 0;
stack.Push("Item to be popped");
stack.Pop();
int actualCount = stack.Count();
Assert.AreEqual(expectedCount, actualCount);
}
public void Stack_Peek_DoesntRemoveNode()
{
Stack stack = new Stack();
stack.Push("First Item");
stack.Push("Second Item");
int countBeforePeeking = stack.Count();
stack.Peek();
int countAfterPeeking = stack.Count();
Assert.AreEqual(countBeforePeeking, countAfterPeeking);
}
