def test_error_result_for_smallest_if_min_is_more_than_max(self):
with self.assertRaisesWithMessage(ValueError):
value, factors = smallest(min_factor=10000, max_factor=1)
def test_finds_the_smallest_palindrome_from_single_digit_factors(self):
value, factors = smallest(min_factor=1, max_factor=9)
self.assertEqual(value, 1)
self.assertFactorsEqual(factors, [[1, 1]])
def test_empty_result_for_smallest_if_no_palindrome_in_the_range(self):
value, factors = smallest(min_factor=1002, max_factor=1003)
self.assertIsNone(value)
self.assertFactorsEqual(factors, [])
def test_find_smallest_palindrome_from_four_digit_factors(self):
value, factors = smallest(min_factor=1000, max_factor=9999)
self.assertEqual(value, 1002001)
self.assertFactorsEqual(factors, [[1001, 1001]])
def test_find_the_smallest_palindrome_from_double_digit_factors(self):
value, factors = smallest(min_factor=10, max_factor=99)
self.assertEqual(value, 121)
self.assertFactorsEqual(factors, [[11, 11]])
def test_error_result_for_smallest_if_min_is_more_than_max(self):
with self.assertRaises(ValueError) as err:
value, factors = smallest(min_factor=10000, max_factor=1)
self.assertEqual(type(err.exception), ValueError)
self.assertEqual(err.exception.args[0], "min must be <= max")
def test_find_smallest_palindrome_from_triple_digit_factors(self):
value, factors = smallest(min_factor=100, max_factor=999)
self.assertEqual(value, 10201)
self.assertFactorsEqual(factors, [(101, 101)])
