def test_1(self):
     result = duplicate_zeros([0, 1])
     self.assertEqual([0, 0], result)
 def test_5(self):
     result = duplicate_zeros([1, 0, 2, 3, 0, 4, 5, 0])
     self.assertEqual([1, 0, 0, 2, 3, 0, 0, 4], result)