import sys
sys.path.append('./datastructures')
from datastructures import Stack
if __name__ == '__main__': # tests
stack = Stack()
stack.push(1)
assert stack.min() == 1
stack.push(2)
assert stack.min() == 1
stack.push(3)
assert stack.min() == 1
stack.push(0)
assert stack.min() == 0
stack.pop()
assert stack.min() == 1
