def test_empty():
s = MyStack()
assert 1 == s.isEmpty()
s.push(1)
assert 0 == s.isEmpty()
s.pop()
assert 1 == s.isEmpty()
def test_peek():
s = MyStack()
s.push(1)
s.push(2)
assert 2 == s.peek()
s.push(3)
assert 3 == s.peek()
s.pop()
assert 2 == s.peek()
def test_size():
s = MyStack()
s.push(1)
s.push(2)
s.push(3)
assert 3 == s.size()
s.pop()
assert 2 == s.size()
s.push(4)
assert 3 == s.size()
def test_sort():
s = MyStack()
s.push(2)
s.push(3)
s.push(1)
s.push(10)
s.push(5)
s.sort()
assert 10 == s.pop()
assert 5 == s.pop()
assert 3 == s.pop()
assert 2 == s.pop()
assert 1 == s.pop()
def test_push():
s = MyStack()
assert 1 == s.push(1)
assert 2 == s.push(2)
assert 2 == s.size()
def test_pop():
s = MyStack()
s.push(1)
s.push(2)
assert 2 == s.pop()
assert 1 == s.pop()
def __init__(self):
self.sMin = MyStack()