code: def test_infer(self):
      assert internal.infer_unknown_dimension((-1, 2, 3), 12) == [
          2,
          2,
          3,
      ]
  
imports: import math
  import unittest
  import numpy
  import pytest
  from cupy._core import internal
  from cupy import testing
label_desc: Use image node_id 3 for calling the TestInferUnknownDimension obj's underlying member method code with example usage: obj.test_infer() without return types