public void Peek_OnStackWithItems_ReturnsLastAdded()
{
//Near-arbitrary stack size for the creation of the stack:
int stackTestSize = 5;
Stack target = new Stack(stackTestSize);
//Push stub data to stack
target.Push("A");
target.Push("B");
target.Push("C");
string expected = "C";
string actual = target.Peek();
Assert.AreEqual(expected, actual);
}
public void Peek_OnFilledThenEmptiedStack_ReturnCorrectItem()
{
//Assemble
int stackTestSize = 3;
Stack target = new Stack(stackTestSize);
//Act
target.Push("A");
target.Push("B");
target.Push("C");
//Pop all but one item from the stack.
target.Pop();
target.Pop();
string expected = target.Peek();
string actual = "A";
//Assert
Assert.AreEqual(expected, actual);
}
public void Peek_OnFullStackArray_ReturnCorrectItem()
{
//Assemble
int stackTestSize = 2;
Stack target = new Stack(stackTestSize);
//Act
target.Push("a");
target.Push("B");
string expected = target.Peek();
string actual = "B";
//Assert
Assert.AreEqual(expected, actual);
}
public void Peek_OnEmptyStack_ReturnsExceptionHandler()
{
//Near-arbitrary stack size for the creation of the stack:
int stackTestSize = 5;
Stack target = new Stack(stackTestSize);
//Peek on an empty stack - will throw an exception in the test.
target.Peek();
}
