def test_equals_2(self): self.assertEqual(group_by_commas(10), '10')
def test_equals_8(self): self.assertEqual(group_by_commas(35235235), '35,235,235')
def test_equals(self): self.assertEqual(group_by_commas(1), '1')
def test_equals_7(self): self.assertEqual(group_by_commas(1000000), '1,000,000')