public void Peek_ForNonEmptyStack_Success()
{
IBasicStack <int> stack = new BasicStack <int>(1);
var itemValue = stack.Peek();
Assert.Equal(1, itemValue);
}
public void FailPopOnEmpty()
{
var sut = new BasicStack <int>();
// Assert
Assert.Throws <InvalidOperationException>(() => sut.Peek());
Assert.Throws <InvalidOperationException>(() => sut.Pop());
}
public void Peek_ForEmptyStack_ThrowsException()
{
IBasicStack <int> stack = new BasicStack <int>();
Assert.ThrowsAny <Exception>(() => stack.Peek());
}