def test_isdisjoint_no(self):
ss = StackSet([2,3,4,5])
tt = StackSet([9,7,4])
assert not ss.isdisjoint(tt)
def test_isdisjoint_yes(self):
ss = StackSet([1,3,5,7,9])
tt = StackSet([0,2,4,6,8])
assert ss.isdisjoint(tt)