def test_compute_simple_subtraction(one, subtraction):
token_stack: TokenStack = TokenStack.get_instance()
token_stack.push(one)
token_stack.push(one)
token_stack.push(subtraction)
number: Number = RpnCalculator(token_stack).compute()
assert token_stack.empty()
assert len(number.digits) == 1
assert number.digits[0] == 0
def test_compute_simple_addition(one, addition):
token_stack: TokenStack = TokenStack.get_instance()
token_stack.push(one)
token_stack.push(one)
token_stack.push(addition)
number: Number = RpnCalculator(token_stack).compute()
assert token_stack.empty()
assert number.sign == Sign.positive
assert len(number.digits) == 1
assert number.digits[0] == 2
def token_stack():
token_stack = TokenStack.get_instance()
token_stack.clear()
return token_stack
def compute(self) -> Number:
b: Number = TokenStack.get_instance().pop()
a: Number = TokenStack.get_instance().pop()
return self.compute_with_numbers(a, b)