def test_result(i, j, expected):
calc = RpnCalculator()
calc.push(i, j)
v = calc.result()
assert_that(v).is_equal_to(expected)
def test_stack(i, j, expected):
calc = RpnCalculator()
calc.push(i, j)
stack = calc.stack()
assert_that(stack).is_equal_to(expected)
def test_pop(i, expected):
calc = RpnCalculator()
calc.push(i)
v = calc.pop()
assert_that(v).is_equal_to(expected)
def test_push_multiple(i, j, k, expected):
calc = RpnCalculator()
calc.push(i, j, k)
v = calc.result()
assert_that(v).is_equal_to(expected)
def test_clear():
calc = RpnCalculator()
calc.push(1, 2)
assert_that(calc.stack()).is_not_empty()
calc.clear()
assert_that(calc.stack()).is_empty()
def test_push():
calc = RpnCalculator()
calc.push(0)
def test_push_no_values():
calc = RpnCalculator()
calc.push()
def setUp(self):
self.calc = RpnCalculator()
class TestRpnCalculator(unittest.TestCase):
def setUp(self):
self.calc = RpnCalculator()
def test_010_adds_two_numbers(self):
self.calc.push(2)
self.calc.push(3)
self.calc.plus()
self.assertEqual(self.calc.value(), 5)
def test_020_adds_three_numbers(self):
self.calc.push(2)
self.calc.push(3)
self.calc.push(4)
self.calc.plus()
self.assertEqual(self.calc.value(), 7)
self.calc.plus()
self.assertEqual(self.calc.value(), 9)
def test_030_subtracts_second_number_from_first_number(self):
self.calc.push(2)
self.calc.push(3)
self.calc.minus()
self.assertEqual(self.calc.value(), -1)
def test_040_adds_and_subtracts(self):
self.calc.push(2)
self.calc.push(3)
self.calc.push(4)
self.calc.minus()
self.assertEqual(self.calc.value(), -1)
self.calc.plus()
self.assertEqual(self.calc.value(), 1)
def test_050_multiplies_and_divides(self):
self.calc.push(2)
self.calc.push(3)
self.calc.push(4)
self.calc.divide()
self.assertEqual(self.calc.value(), 3.0 / 4.0)
self.calc.times()
self.assertEqual(self.calc.value(), 2.0 * (3.0 / 4.0))
def test_060_resolves_operator_precedence_unambiguously(self):
"""
1 2 + 3 * => (1 + 2) * 3
"""
self.calc.push(1)
self.calc.push(2)
self.calc.plus()
self.calc.push(3)
self.calc.times()
self.assertEqual(self.calc.value(), 9)
# 1 2 3 * + => 1 + (2 * 3)
self.calc.push(1)
self.calc.push(2)
self.calc.push(3)
self.calc.times()
self.calc.plus()
self.assertEqual(self.calc.value(), 7)
def test_070_fails_informatively_when_theres_not_enough_values(self):
self.assertRaises(CalculatorIsEmpty, self.calc.plus)
self.assertRaises(CalculatorIsEmpty, self.calc.minus)
self.assertRaises(CalculatorIsEmpty, self.calc.times)
self.assertRaises(CalculatorIsEmpty, self.calc.divide)