def test_amount_increases_when_inserting_coin():
turnstile = Turnstile(amount_for_passing=10)
turnstile.insert_coin(5)
assert turnstile.current_amount() == 5
def test_amount_in_turnstile_is_reset_after_unlocking():
turnstile = Turnstile(amount_for_passing=10)
turnstile.insert_coin(15)
assert turnstile.current_amount() == 0