def str_to_rational_number(str_number):
search = re.search(RationalNumberViewModel.RATIONAL_NUMBER_REGEX,
str_number)
numerator = int(search.group(1))
denominator = int(search.group(2))
number = RationalNumber(numerator, denominator)
return number
def test_mult_rational_numbers(self):
number1 = RationalNumber(-2, 5)
number2 = RationalNumber(3, 4)
self.assertEquals(number1 * number2, -RationalNumber(3, 10))
def test_subtract_rational_numbers(self):
number1 = RationalNumber(-1, 2)
number2 = RationalNumber(2, 3)
self.assertEquals(number1 - number2, RationalNumber(-7, 6))
def test_unary_minus_rational_number2(self):
number = RationalNumber(11, -10)
self.assertEquals(number, -(-number))
def test_unary_minus_rational_number1(self):
number1 = RationalNumber(11, -10)
number2 = RationalNumber(11, 10)
self.assertEquals(number1, -number2)
def test_add_rational_numbers2(self):
number1 = RationalNumber(11, 10)
number2 = RationalNumber(2, 5)
self.assertEquals(number1 + number2, RationalNumber(3, 2))
def test_can_create_rational_number(self):
number = RationalNumber(-1, 2)
self.assertTrue(isinstance(number, RationalNumber))
def test_can_not_create_rational_number_from_bad_str(self):
with self.assertRaises(TypeError):
RationalNumber('a', 1)
with self.assertRaises(TypeError):
RationalNumber(1, 'b')
def test_str_rational_number2(self):
number = RationalNumber(-5, 5)
self.assertEquals(str(number), '-1')
def test_str_rational_number1(self):
number = RationalNumber(3, -4)
self.assertEquals(str(number), '-3/4')
def test_can_check_not_equality_rational_numbers2(self):
number = RationalNumber(-1, 2)
self.assertNotEquals(number, RationalNumber(-1, 3))
def test_reduce_rational_number2(self):
number = RationalNumber(-27, 144)
self.assertEquals(number, RationalNumber(3, -16))
def test_reduce_rational_number1(self):
number = RationalNumber(-1, 2)
self.assertEquals(number, RationalNumber(2, -4))
def test_reduce_zero_rational_number(self):
number = RationalNumber(0, 3)
self.assertEquals(number, RationalNumber(0, 1))
def test_can_check_equality_rational_numbers1(self):
number = RationalNumber(-1, 2)
self.assertEquals(number, RationalNumber(-1, 2))
def test_division_rational_numbers(self):
number1 = RationalNumber(-2, 5)
number2 = RationalNumber(4, 3)
self.assertEquals(number1 / number2, -RationalNumber(3, 10))
def test_add_rational_numbers1(self):
number1 = RationalNumber(-1, 2)
number2 = RationalNumber(2, 3)
self.assertEquals(number1 + number2, RationalNumber(1, 6))
def test_can_not_create_divide_zero_rational_number(self):
with self.assertRaises(ZeroDivisionError):
RationalNumber(1, 0)