code: def test_cast(self):
      x = zvector()
      with pytest.raises(TypeError):
          cast(x, "int32")
  
imports: import numpy
  import pytest
  import pytensor
  from pytensor.gradient import GradientError
  from pytensor.tensor.basic import cast
  from pytensor.tensor.math import complex
  from pytensor.tensor.math import complex_from_polar, imag, real
  from pytensor.tensor.type import cvector, dvector, fmatrix, fvector, imatrix, zvector
  from tests import unittest_tools
label_desc: Use image node_id 3 for calling the TestRealImag obj's underlying member method code with example usage: obj.test_cast() without return types