def test_start_stop_step_config_cannot_exceed_bounds(self):
# start (3995) + step (10) will exceed stop (3999)
self.assertRaises(OverflowError,
lambda: roman_range(start=3995, stop=3999, step=10))
# start (10) + step (200) will exceed stop (100)
self.assertRaises(OverflowError,
lambda: roman_range(start=10, stop=100, step=200))
# step should be -1 in order to go from 100 to 1
self.assertRaises(OverflowError,
lambda: roman_range(start=100, stop=1, step=1))
# start (10) + step (-6) will exceed stop (5)
self.assertRaises(OverflowError,
lambda: roman_range(start=10, stop=5, step=-6))
def test_range_returns_expected_generator_for_start_stop_step_call(self):
generator = roman_range(start=10, stop=30, step=5)
self.assertEqual(generator.__next__(), 'X')
self.assertEqual(generator.__next__(), 'XV')
self.assertEqual(generator.__next__(), 'XX')
self.assertEqual(generator.__next__(), 'XXV')
self.assertEqual(generator.__next__(), 'XXX')
# generator has been consumed, so another call will raise an exception
self.assertRaises(StopIteration, generator.__next__)
def test_range_returns_expected_generator_for_count_call(self):
generator = roman_range(10)
self.assertEqual(generator.__next__(), 'I')
self.assertEqual(generator.__next__(), 'II')
self.assertEqual(generator.__next__(), 'III')
self.assertEqual(generator.__next__(), 'IV')
self.assertEqual(generator.__next__(), 'V')
self.assertEqual(generator.__next__(), 'VI')
self.assertEqual(generator.__next__(), 'VII')
self.assertEqual(generator.__next__(), 'VIII')
self.assertEqual(generator.__next__(), 'IX')
self.assertEqual(generator.__next__(), 'X')
# generator has been consumed, so another call will raise an exception
self.assertRaises(StopIteration, generator.__next__)
def test_range_returns_expected_generator_for_start_stop_call_backward(
self):
generator = roman_range(start=10, stop=1, step=-1)
self.assertEqual(generator.__next__(), 'X')
self.assertEqual(generator.__next__(), 'IX')
self.assertEqual(generator.__next__(), 'VIII')
self.assertEqual(generator.__next__(), 'VII')
self.assertEqual(generator.__next__(), 'VI')
self.assertEqual(generator.__next__(), 'V')
self.assertEqual(generator.__next__(), 'IV')
self.assertEqual(generator.__next__(), 'III')
self.assertEqual(generator.__next__(), 'II')
self.assertEqual(generator.__next__(), 'I')
# generator has been consumed, so another call will raise an exception
self.assertRaises(StopIteration, generator.__next__)
def test_range_raise_exception_if_stop_is_invalid(self):
msg = '"stop" must be an integer in the range 1-3999'
with self.assertRaises(ValueError) as raised:
roman_range(0)
self.assertEqual(str(raised.exception), msg)
with self.assertRaises(ValueError) as raised:
# noinspection PyTypeChecker
roman_range(9.9)
self.assertEqual(str(raised.exception), msg)
with self.assertRaises(ValueError) as raised:
roman_range(4000)
self.assertEqual(str(raised.exception), msg)
with self.assertRaises(ValueError) as raised:
roman_range(-4000)
self.assertEqual(str(raised.exception), msg)
def test_stop_param_cannot_be_less_than_1(self):
self.assertRaises(ValueError, lambda: roman_range(start=1, stop=0))
self.assertRaises(ValueError,
lambda: roman_range(start=1, stop=-99, step=-1))
def test_start_param_cannot_be_less_than_1(self):
self.assertRaises(ValueError, lambda: roman_range(start=0, stop=10))
self.assertRaises(ValueError, lambda: roman_range(start=-1, stop=10))
self.assertRaises(ValueError, lambda: roman_range(start=-55, stop=10))
def test_stop_param_cannot_be_greater_than_3999(self):
self.assertRaises(ValueError, lambda: roman_range(start=1, stop=4000))
self.assertRaises(ValueError, lambda: roman_range(start=1, stop=10000))
