def test_duplicate_numbers(self):
self.assertEqual(format_ranges([10, 20, 10, 12, 11, 20]),
'10,10-12,20,20')
self.assertEqual(format_ranges([10, 11, 20, 10, 12, 11, 12]),
'10-12,10-12,20')
self.assertEqual(format_ranges([1, 9, 1, 7, 3, 8, 2, 4, 2, 4, 7]),
'1-2,1-4,4,7,7-9')
def test_one_group(self):
self.assertEqual(format_ranges([1, 2, 3]), '1-3')
def test_unordered_numbers(self):
self.assertEqual(format_ranges([10, 20, 12, 3, 11]), '3,10-12,20')
def test_lone_numbers(self):
self.assertEqual(format_ranges([1]), '1')
self.assertEqual(format_ranges([4, 16, 18]), '4,16,18')
self.assertEqual(format_ranges([1, 10, 11, 12, 13, 14]), '1,10-14')
def test_non_sequences(self):
self.assertEqual(format_ranges(iter([4, 5, 16, 17, 18, 20, 21])),
'4-5,16-18,20-21')
def test_three_groups(self):
self.assertEqual(format_ranges([4, 5, 16, 17, 18, 20, 21]),
'4-5,16-18,20-21')
def test_two_groups(self):
self.assertEqual(format_ranges([1, 2, 10, 11, 12, 13, 14]),
'1-2,10-14')
def test_lone_numbers(self):
self.assertEqual(format_ranges([1]), "1")
self.assertEqual(format_ranges([4, 16, 18]), "4,16,18")
self.assertEqual(format_ranges([1, 10, 11, 12, 13, 14]), "1,10-14")
