def test_save_load_blocks(string):
a, b = save_blocks(string)
assert load_blocks(a, b) == string
def test_save_blocks():
a, b = save_blocks('<code>nobody</code> := <code>chickens</code>')
assert a == '<\b> := <\b>'
assert b.pop() == '<code>chickens</code>'
assert b.pop() == '<code>nobody</code>'