public void New_created_stack_have_not_elements()
{
MyStack <int> stack = new MyStack <int>();
Assert.AreEqual(0, stack.Count());
}
public void Peak_empty_stack_throw_exception()
{
MyStack <int> stack = new MyStack <int>();
Assert.Catch <InvalidOperationException>(() => stack.Peak());
}
public void New_created_stack_is_empty()
{
MyStack <int> stack = new MyStack <int>();
Assert.IsTrue(stack.IsEmpty());
}