code: def test_memory(self):
      z = np.random.randn(400).astype(np.float32)
      new_z = drv.from_device_like(drv.to_device(z), z)
      assert la.norm(new_z - z) == 0
  
imports: import numpy
  import numpy.linalg
  from pycuda.tools import mark_cuda_test, dtype_to_ctype
  import pytest
  import pycuda.gpuarray
  import pycuda.driver
  from pycuda.compiler import SourceModule
label_desc: Use image node_id 1 for calling the TestDriver obj's underlying member method code with example usage: obj.test_memory() without return types