code: def test_invalid_dtype(self):
      with self.assertRaises(TypeError):
          testing.generate_matrix(
              (2, 2), dtype=numpy.int32, singular_values=1
          )
  
imports: import unittest
  import numpy
  import pytest
  import cupy
  from cupy import testing
label_desc: Use image node_id 4 for calling the TestGenerateMatrixInvalid obj's underlying member method code with example usage: obj.test_invalid_dtype() without return types