code: def test_decomposition(self, dtype):
      A = numpy.array([[1, -2], [-2, 1]]).astype(dtype)
      self.check_L(A)
  
imports: import unittest
  import numpy
  import pytest
  import cupy
  from cupyx import cusolver
  from cupy.cuda import driver
  from cupy.cuda import runtime
  from cupy.linalg import _util
  from cupy import testing
  from cupy.testing import _condition
  import cupyx
label_desc: Use image node_id 2 for calling the TestCholeskyInvalid obj's underlying member method code with example usage: obj.test_decomposition(dtype) without return types