def test_find_left_operand():
function_string = "1+2"
sign_position = 1
returned_operand = OperandFinder.find_left_operand(function_string,
sign_position)
expected_operand = Operand(0, "1", 1)
assert returned_operand == expected_operand
def test_find_right_operand_tail_position():
function_string = "1+2"
sign_position = 1
returned_operand_tail = OperandFinder.find_right_operand_tail(
function_string, sign_position)
expected_operand_tail = 3
assert returned_operand_tail == expected_operand_tail
def test_find_left_operand_position_():
function_string = "1+2+3"
sign_position = 3
returned_operand_position = OperandFinder.find_left_operand_position(
function_string, sign_position)
expected_operand_position = 2
assert returned_operand_position == expected_operand_position
def test_find_right_sign_operand():
function_string = "1+2"
sign_position = 1
returned_operand = OperandFinder.find_right_operand(
function_string, sign_position)
expected_operand = Operand(2, "2", 3)
assert returned_operand == expected_operand
def test_do_operation_with_zero_result():
function_string = "1-1"
operand_finder = OperandFinder()
operation = Substraction(operand_finder, 1, 1)
returned_function_string = operation.do_operation(function_string)
expected_function_string = "0.0"
assert returned_function_string == expected_function_string
def test_do_operation_with_negative_left_operand():
function_string = "-1-1"
operand_finder = OperandFinder()
operation = Substraction(operand_finder, 2, 1)
returned_function_string = operation.do_operation(function_string)
expected_function_string = "-2.0"
assert returned_function_string == expected_function_string
def test_do_operation():
function_string = "1+1"
operand_finder = OperandFinder()
operation = Addition(operand_finder, 1, 1)
returned_function_string = operation.do_operation(function_string)
expected_function_string = "2.0"
assert returned_function_string == expected_function_string
def test_do_operation_warns_right_operation():
class SubstractionSpy(Substraction):
def update_positions_after_shift(self, shift_length):
super()
self.was_warned = True
function_string = "1-1-1"
operand_finder = OperandFinder()
operation = Substraction(operand_finder, 1, 1)
right_operation = SubstractionSpy(operand_finder, 3, 1)
operation.set_right_operation(right_operation)
operation.do_operation(function_string)
assert right_operation.was_warned
def create(sign: str, sign_position: int):
operand_finder = OperandFinder()
if sign == Sign.EXPONENTIATION_CHARACTER:
return Exponentiation(operand_finder, sign_position,
Sign.EXPONENTIATION_PRIORITY)
if sign == Sign.DIVISION_CHARACTER:
return Division(operand_finder, sign_position,
Sign.DIVISION_PRIORITY)
if sign == Sign.MULTIPLICATION_CHARACTER:
return Multiplication(operand_finder, sign_position,
Sign.MULTIPLICATION_PRIORITY)
if sign == Sign.SUBSTRACTION_CHARACTER:
return Substraction(operand_finder, sign_position,
Sign.SUBSTRACTION_PRIORITY)
elif sign == Sign.ADDITION_CHARACTER:
return Addition(operand_finder, sign_position,
Sign.ADDITION_PRIORITY)
else:
raise NotImplementedError
def test_find_right_negative_operand(function_string, sign_position,
expected_right_operand_string):
right_operand = OperandFinder.find_right_operand(function_string,
sign_position)
assert right_operand.operand == expected_right_operand_string